diff --git a/gio/gdbusconnection.c b/gio/gdbusconnection.c
index 3411033f3..dbfc53953 100644
--- a/gio/gdbusconnection.c
+++ b/gio/gdbusconnection.c
@@ -5726,17 +5726,19 @@ g_dbus_connection_call_done (GObject      *source,
       _g_dbus_debug_print_lock ();
       g_print ("========================================================================\n"
                "GDBus-debug:Call:\n"
-               " <<<< ASYNC COMPLETE %s() (serial %d)\n"
-               "      ",
-               state->method_name,
-               g_dbus_message_get_reply_serial (reply));
+               " <<<< ASYNC COMPLETE %s()",
+               state->method_name);
+
       if (reply != NULL)
         {
-          g_print ("SUCCESS\n");
+          g_print (" (serial %d)\n"
+                   "      SUCCESS\n",
+                   g_dbus_message_get_reply_serial (reply));
         }
       else
         {
-          g_print ("FAILED: %s\n",
+          g_print ("\n"
+                   "      FAILED: %s\n",
                    error->message);
         }
       _g_dbus_debug_print_unlock ();
diff --git a/gio/tests/gdbus-connection-flush.c b/gio/tests/gdbus-connection-flush.c
index 39f08e8aa..73a034b81 100644
--- a/gio/tests/gdbus-connection-flush.c
+++ b/gio/tests/gdbus-connection-flush.c
@@ -368,6 +368,9 @@ main (int   argc,
 {
   gint ret;
 
+  /* FIXME: Add debug for https://gitlab.gnome.org/GNOME/glib/issues/1929 */
+  g_setenv ("G_DBUS_DEBUG", "authentication", TRUE);
+
   g_test_init (&argc, &argv, NULL);
 
   g_test_add ("/gdbus/connection/flush/busy", Fixture, NULL,
diff --git a/gio/tests/gdbus-connection.c b/gio/tests/gdbus-connection.c
index 6e4c7eb05..469018577 100644
--- a/gio/tests/gdbus-connection.c
+++ b/gio/tests/gdbus-connection.c
@@ -1256,6 +1256,10 @@ main (int   argc,
       char *argv[])
 {
   int ret;
+
+  /* FIXME: Add debug for https://gitlab.gnome.org/GNOME/glib/issues/1957 */
+  g_setenv ("G_DBUS_DEBUG", "all", TRUE);
+
   g_test_init (&argc, &argv, NULL);
 
   /* all the tests rely on a shared main loop */
diff --git a/gio/tests/gdbus-server-auth.c b/gio/tests/gdbus-server-auth.c
index d7312eab1..d8b361fc6 100644
--- a/gio/tests/gdbus-server-auth.c
+++ b/gio/tests/gdbus-server-auth.c
@@ -515,6 +515,9 @@ int
 main (int   argc,
       char *argv[])
 {
+  /* FIXME: Add debug for https://gitlab.gnome.org/GNOME/glib/issues/1954 */
+  g_setenv ("G_DBUS_DEBUG", "all", TRUE);
+
   g_test_init (&argc, &argv, NULL);
 
   g_test_add_func ("/gdbus/server-auth", test_server_auth);