diff --git a/docs/reference/gio/gio-sections-common.txt b/docs/reference/gio/gio-sections-common.txt
index 39999c452..314d1009e 100644
--- a/docs/reference/gio/gio-sections-common.txt
+++ b/docs/reference/gio/gio-sections-common.txt
@@ -3026,6 +3026,8 @@ g_dbus_method_invocation_return_gerror
 g_dbus_method_invocation_return_dbus_error
 g_dbus_method_invocation_take_error
 g_dbus_method_invocation_return_value_with_unix_fd_list
+G_DBUS_METHOD_INVOCATION_HANDLED
+G_DBUS_METHOD_INVOCATION_UNHANDLED
 <SUBSECTION Standard>
 G_DBUS_METHOD_INVOCATION
 G_IS_DBUS_METHOD_INVOCATION
diff --git a/gio/gdbus-2.0/codegen/codegen.py b/gio/gdbus-2.0/codegen/codegen.py
index 5234b3807..cda047173 100644
--- a/gio/gdbus-2.0/codegen/codegen.py
+++ b/gio/gdbus-2.0/codegen/codegen.py
@@ -1522,7 +1522,7 @@ class CodeGenerator:
                         '   *\n'
                         '   * If a signal handler returns %%TRUE, it means the signal handler will handle the invocation (e.g. take a reference to @invocation and eventually call %s_complete_%s() or e.g. g_dbus_method_invocation_return_error() on it) and no order signal handlers will run. If no signal handler handles the invocation, the %%G_DBUS_ERROR_UNKNOWN_METHOD error is returned.\n'
                         '   *\n'
-                        '   * Returns: %%TRUE if the invocation was handled, %%FALSE to let other signal handlers run.\n'
+                        '   * Returns: %%G_DBUS_METHOD_INVOCATION_HANDLED or %%TRUE if the invocation was handled, %%G_DBUS_METHOD_INVOCATION_UNHANDLED or %%FALSE to let other signal handlers run.\n'
                         %(i.name, m.name, i.name_lower, m.name_lower), False))
                 self.write_gtkdoc_deprecated_and_since_and_close(m, self.outfile, 2)
                 if m.unix_fd:
diff --git a/gio/gdbusmethodinvocation.h b/gio/gdbusmethodinvocation.h
index 061256ffe..775070a2c 100644
--- a/gio/gdbusmethodinvocation.h
+++ b/gio/gdbusmethodinvocation.h
@@ -33,6 +33,41 @@ G_BEGIN_DECLS
 #define G_DBUS_METHOD_INVOCATION(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_DBUS_METHOD_INVOCATION, GDBusMethodInvocation))
 #define G_IS_DBUS_METHOD_INVOCATION(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_DBUS_METHOD_INVOCATION))
 
+/**
+ * G_DBUS_METHOD_INVOCATION_HANDLED:
+ *
+ * The value returned by handlers of the signals generated by
+ * the `gdbus-codegen` tool to indicate that a method call has been
+ * handled by an implementation. It is equal to %TRUE, but using
+ * this macro is sometimes more readable.
+ *
+ * In code that needs to be backwards-compatible with older GLib,
+ * use %TRUE instead, often written like this:
+ *
+ * |[
+ *   g_dbus_method_invocation_return_error (invocation, ...);
+ *   return TRUE;    // handled
+ * ]|
+ *
+ * Since: 2.68
+ */
+#define G_DBUS_METHOD_INVOCATION_HANDLED TRUE GLIB_AVAILABLE_MACRO_IN_2_68
+
+/**
+ * G_DBUS_METHOD_INVOCATION_UNHANDLED:
+ *
+ * The value returned by handlers of the signals generated by
+ * the `gdbus-codegen` tool to indicate that a method call has not been
+ * handled by an implementation. It is equal to %FALSE, but using
+ * this macro is sometimes more readable.
+ *
+ * In code that needs to be backwards-compatible with older GLib,
+ * use %FALSE instead.
+ *
+ * Since: 2.68
+ */
+#define G_DBUS_METHOD_INVOCATION_UNHANDLED FALSE GLIB_AVAILABLE_MACRO_IN_2_68
+
 GLIB_AVAILABLE_IN_ALL
 GType                  g_dbus_method_invocation_get_type             (void) G_GNUC_CONST;
 GLIB_AVAILABLE_IN_ALL
diff --git a/gio/tests/gdbus-auth.c b/gio/tests/gdbus-auth.c
index 8be4473c7..18288f36d 100644
--- a/gio/tests/gdbus-auth.c
+++ b/gio/tests/gdbus-auth.c
@@ -121,7 +121,7 @@ test_auth_on_timeout (gpointer user_data)
 {
   g_error ("Timeout waiting for client");
   g_assert_not_reached ();
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 
diff --git a/gio/tests/gdbus-close-pending.c b/gio/tests/gdbus-close-pending.c
index d2c5b62f5..bd8fda5a7 100644
--- a/gio/tests/gdbus-close-pending.c
+++ b/gio/tests/gdbus-close-pending.c
@@ -188,7 +188,7 @@ delayed_close_cb (gpointer data)
     close_async (df->stream, df->io_priority, df->cancellable, df->callback,
                  df->user_data);
 
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 static void
diff --git a/gio/tests/gdbus-connection-loss.c b/gio/tests/gdbus-connection-loss.c
index a34a9923c..cc88cb0cc 100644
--- a/gio/tests/gdbus-connection-loss.c
+++ b/gio/tests/gdbus-connection-loss.c
@@ -53,7 +53,7 @@ on_timeout (gpointer user_data)
 {
   /* tear down bus */
   session_bus_stop ();
-  return FALSE; /* remove source */
+  return G_SOURCE_REMOVE;
 }
 
 static void
diff --git a/gio/tests/gdbus-connection-slow.c b/gio/tests/gdbus-connection-slow.c
index dd1ababd4..27a6af3c4 100644
--- a/gio/tests/gdbus-connection-slow.c
+++ b/gio/tests/gdbus-connection-slow.c
@@ -49,7 +49,7 @@ test_connection_flush_on_timeout (gpointer user_data)
   guint iteration = GPOINTER_TO_UINT (user_data);
   g_printerr ("Timeout waiting 1000 msec on iteration %d\n", iteration);
   g_assert_not_reached ();
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 static void
@@ -125,7 +125,7 @@ large_message_timeout_cb (gpointer data)
 
   g_error ("Error: timeout waiting for dbus name to appear");
 
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 static void
diff --git a/gio/tests/gdbus-connection.c b/gio/tests/gdbus-connection.c
index 7bd7a02f4..278570609 100644
--- a/gio/tests/gdbus-connection.c
+++ b/gio/tests/gdbus-connection.c
@@ -65,7 +65,7 @@ test_connection_quit_mainloop (gpointer user_data)
   _log ("quit_mainloop_fired");
   *quit_mainloop_fired = TRUE;
   g_main_loop_quit (loop);
-  return TRUE;
+  return G_SOURCE_CONTINUE;
 }
 
 /* ---------------------------------------------------------------------------------------------------- */
@@ -934,7 +934,7 @@ test_connection_filter_on_timeout (gpointer user_data)
 {
   g_printerr ("Timeout waiting 30 sec on service\n");
   g_assert_not_reached ();
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 static void
diff --git a/gio/tests/gdbus-example-objectmanager-server.c b/gio/tests/gdbus-example-objectmanager-server.c
index c460e66e9..dcedba2d1 100644
--- a/gio/tests/gdbus-example-objectmanager-server.c
+++ b/gio/tests/gdbus-example-objectmanager-server.c
@@ -53,7 +53,7 @@ on_animal_poke (ExampleAnimal          *animal,
   g_assert_not_reached ();
 
  out:
-  return TRUE; /* to indicate that the method was handled */
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 
diff --git a/gio/tests/gdbus-example-server.c b/gio/tests/gdbus-example-server.c
index 6f1123d85..00e482724 100644
--- a/gio/tests/gdbus-example-server.c
+++ b/gio/tests/gdbus-example-server.c
@@ -315,7 +315,7 @@ on_timeout_cb (gpointer user_data)
   g_assert_no_error (error);
 
 
-  return TRUE;
+  return G_SOURCE_CONTINUE;
 }
 
 /* ---------------------------------------------------------------------------------------------------- */
diff --git a/gio/tests/gdbus-exit-on-close.c b/gio/tests/gdbus-exit-on-close.c
index 3c4e5ecd6..4241fc7a4 100644
--- a/gio/tests/gdbus-exit-on-close.c
+++ b/gio/tests/gdbus-exit-on-close.c
@@ -57,7 +57,7 @@ quit_later_cb (gpointer data G_GNUC_UNUSED)
 {
   g_main_loop_quit (loop);
 
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 static void
diff --git a/gio/tests/gdbus-overflow.c b/gio/tests/gdbus-overflow.c
index 53ec9c0b6..ca3d5d0e7 100644
--- a/gio/tests/gdbus-overflow.c
+++ b/gio/tests/gdbus-overflow.c
@@ -95,7 +95,7 @@ static gboolean
 overflow_on_500ms_later_func (gpointer user_data)
 {
   g_main_loop_quit (loop);
-  return FALSE; /* don't keep the idle */
+  return G_SOURCE_REMOVE;
 }
 
 static void
diff --git a/gio/tests/gdbus-peer.c b/gio/tests/gdbus-peer.c
index 617d7561a..ca53528d2 100644
--- a/gio/tests/gdbus-peer.c
+++ b/gio/tests/gdbus-peer.c
@@ -644,7 +644,7 @@ check_connection (gpointer user_data)
         }
     }
 
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 static gboolean
@@ -654,7 +654,7 @@ on_do_disconnect_in_idle (gpointer data)
   g_debug ("GDC %p has ref_count %d", c, G_OBJECT (c)->ref_count);
   g_dbus_connection_disconnect (c);
   g_object_unref (c);
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 #endif
 
@@ -1719,7 +1719,7 @@ codegen_on_animal_poke (ExampleAnimal          *animal,
   g_assert_not_reached ();
 
  out:
-  return TRUE; /* to indicate that the method was handled */
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 /* Runs in thread we created GDBusServer in (since we didn't pass G_DBUS_SERVER_FLAGS_RUN_IN_THREAD) */
@@ -1794,7 +1794,7 @@ static gboolean
 codegen_quit_mainloop_timeout (gpointer data)
 {
   g_main_loop_quit (loop);
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 static void
diff --git a/gio/tests/gdbus-test-codegen.c b/gio/tests/gdbus-test-codegen.c
index bb1d059ca..9a3ffa927 100644
--- a/gio/tests/gdbus-test-codegen.c
+++ b/gio/tests/gdbus-test-codegen.c
@@ -33,6 +33,11 @@
 
 #include "gdbus-test-codegen-generated-interface-info.h"
 
+#if GLIB_VERSION_MIN_REQUIRED < GLIB_VERSION_2_68
+# undef G_DBUS_METHOD_INVOCATION_HANDLED
+# define G_DBUS_METHOD_INVOCATION_HANDLED TRUE
+#endif
+
 /* ---------------------------------------------------------------------------------------------------- */
 
 static guint
@@ -100,7 +105,7 @@ on_handle_hello_world (FooiGenBar             *object,
   response = g_strdup_printf ("Word! You said '%s'. I'm Skeleton, btw!", greeting);
   foo_igen_bar_complete_hello_world (object, invocation, response);
   g_free (response);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -145,7 +150,7 @@ on_handle_test_primitive_types (FooiGenBar            *object,
   g_free (s1);
   g_free (s2);
   g_free (s3);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -185,7 +190,7 @@ on_handle_test_non_primitive_types (FooiGenBar            *object,
                                                   array_of_bytestrings,
                                                   str->str);
   g_string_free (str, TRUE);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -202,7 +207,7 @@ on_handle_request_signal_emission (FooiGenBar             *object,
       foo_igen_bar_emit_test_signal (object, 43, a_strv, a_bytestring_array, a_variant); /* consumes a_variant */
       foo_igen_bar_complete_request_signal_emission (object, invocation);
     }
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -218,7 +223,7 @@ on_handle_request_multi_property_mods (FooiGenBar             *object,
   foo_igen_bar_set_y (object, foo_igen_bar_get_y (object) + 1);
   foo_igen_bar_set_i (object, foo_igen_bar_get_i (object) + 1);
   foo_igen_bar_complete_request_multi_property_mods (object, invocation);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -238,7 +243,7 @@ on_handle_property_cancellation (FooiGenBar             *object,
   g_dbus_interface_skeleton_flush (G_DBUS_INTERFACE_SKELETON (object));
   /* this makes us return the reply D-Bus method */
   foo_igen_bar_complete_property_cancellation (object, invocation);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 /* ---------------------------------------------------------------------------------------------------- */
@@ -293,7 +298,7 @@ on_handle_force_method (FooiGenBat             *object,
   g_variant_unref (ret_ay);
   g_variant_unref (ret_struct);
 
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 
@@ -382,7 +387,7 @@ on_handle_check_not_authorized (FooiGenAuthorize       *object,
                                 gpointer                user_data)
 {
   foo_igen_authorize_complete_check_not_authorized (object, invocation);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -391,7 +396,7 @@ on_handle_check_authorized (FooiGenAuthorize       *object,
                             gpointer                user_data)
 {
   foo_igen_authorize_complete_check_authorized (object, invocation);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -400,7 +405,7 @@ on_handle_check_not_authorized_from_object (FooiGenAuthorize       *object,
                                             gpointer                user_data)
 {
   foo_igen_authorize_complete_check_not_authorized_from_object (object, invocation);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 /* ---------------------------------------------------------------------------------------------------- */
@@ -414,7 +419,7 @@ on_handle_get_self (FooiGenMethodThreads   *object,
   s = g_strdup_printf ("%p", (void *)g_thread_self ());
   foo_igen_method_threads_complete_get_self (object, invocation, s);
   g_free (s);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 /* ---------------------------------------------------------------------------------------------------- */
@@ -2645,7 +2650,7 @@ handle_hello_fd (FooiGenFDPassing *object,
                  const gchar *arg_greeting)
 {
   foo_igen_fdpassing_complete_hello_fd (object, invocation, fd_list, arg_greeting);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 #if GLIB_VERSION_MIN_REQUIRED >= GLIB_VERSION_2_64
@@ -2657,7 +2662,7 @@ handle_no_annotation (FooiGenFDPassing *object,
                       const gchar *arg_greeting_locale)
 {
   foo_igen_fdpassing_complete_no_annotation (object, invocation, fd_list, arg_greeting, arg_greeting_locale);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -2667,7 +2672,7 @@ handle_no_annotation_nested (FooiGenFDPassing *object,
                              GVariant *arg_files)
 {
   foo_igen_fdpassing_complete_no_annotation_nested (object, invocation, fd_list);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 #else
 static gboolean
@@ -2677,7 +2682,7 @@ handle_no_annotation (FooiGenFDPassing *object,
                       const gchar *arg_greeting_locale)
 {
   foo_igen_fdpassing_complete_no_annotation (object, invocation, arg_greeting, arg_greeting_locale);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 
 static gboolean
@@ -2686,7 +2691,7 @@ handle_no_annotation_nested (FooiGenFDPassing *object,
                              GVariant *arg_files)
 {
   foo_igen_fdpassing_complete_no_annotation_nested (object, invocation);
-  return TRUE;
+  return G_DBUS_METHOD_INVOCATION_HANDLED;
 }
 #endif
 
diff --git a/gio/tests/gdbus-tests.c b/gio/tests/gdbus-tests.c
index bed0d24f7..1003d07e0 100644
--- a/gio/tests/gdbus-tests.c
+++ b/gio/tests/gdbus-tests.c
@@ -48,7 +48,7 @@ on_property_notify_timeout (gpointer user_data)
   PropertyNotifyData *data = user_data;
   data->timed_out = TRUE;
   g_main_loop_quit (data->loop);
-  return TRUE;
+  return G_SOURCE_CONTINUE;
 }
 
 gboolean
@@ -83,7 +83,7 @@ static gboolean
 _give_up (gpointer data)
 {
   g_error ("%s", (const gchar *) data);
-  g_return_val_if_reached (TRUE);
+  g_return_val_if_reached (G_SOURCE_CONTINUE);
 }
 
 typedef struct
@@ -175,7 +175,7 @@ on_signal_received_timeout (gpointer user_data)
   SignalReceivedData *data = user_data;
   data->timed_out = TRUE;
   g_main_loop_quit (data->loop);
-  return TRUE;
+  return G_SOURCE_CONTINUE;
 }
 
 gboolean