diff --git a/gio/gdbusaddress.c b/gio/gdbusaddress.c
index 0bd0b3937..1b62247fa 100644
--- a/gio/gdbusaddress.c
+++ b/gio/gdbusaddress.c
@@ -619,8 +619,12 @@ g_dbus_address_connect (const gchar   *address_entry,
           g_set_error (error,
                        G_IO_ERROR,
                        G_IO_ERROR_INVALID_ARGUMENT,
-                       _("Error in address “%s” — the host attribute is missing or malformed"),
-                       address_entry);
+                       /* Translators: The first placeholder is a D-Bus connection address,
+                        * the second is the literal name of an attribute in the address.
+                        */
+                       _("Error in address “%s” — the %s attribute is missing or malformed"),
+                       address_entry,
+                       "host");
           goto out;
         }
 
@@ -633,8 +637,9 @@ g_dbus_address_connect (const gchar   *address_entry,
           g_set_error (error,
                        G_IO_ERROR,
                        G_IO_ERROR_INVALID_ARGUMENT,
-                       _("Error in address “%s” — the port attribute is missing or malformed"),
-                       address_entry);
+                       _("Error in address “%s” — the %s attribute is missing or malformed"),
+                       address_entry,
+                       "port");
           goto out;
         }
 
@@ -647,8 +652,9 @@ g_dbus_address_connect (const gchar   *address_entry,
               g_set_error (error,
                            G_IO_ERROR,
                            G_IO_ERROR_INVALID_ARGUMENT,
-                           _("Error in address “%s” — the noncefile attribute is missing or malformed"),
-                           address_entry);
+                           _("Error in address “%s” — the %s attribute is missing or malformed"),
+                           address_entry,
+                           "noncefile");
               goto out;
             }
         }
diff --git a/gio/gdbusconnection.c b/gio/gdbusconnection.c
index d2d98b14d..3587a0928 100644
--- a/gio/gdbusconnection.c
+++ b/gio/gdbusconnection.c
@@ -4716,7 +4716,10 @@ invoke_get_property_in_idle_cb (gpointer _data)
     {
       reply = g_dbus_message_new_method_error (data->message,
                                                DBUS_ERROR_UNKNOWN_METHOD,
-                                               _("No such interface “org.freedesktop.DBus.Properties” on object at path %s"),
+                                               /* Translators: The first placeholder is a D-Bus interface,
+                                                * the second is the path of an object. */
+                                               _("No such interface “%s” on object at path %s"),
+                                               DBUS_INTERFACE_PROPERTIES,
                                                g_dbus_message_get_path (data->message));
       g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
       g_object_unref (reply);
@@ -5070,7 +5073,8 @@ invoke_get_all_properties_in_idle_cb (gpointer _data)
     {
       reply = g_dbus_message_new_method_error (data->message,
                                                DBUS_ERROR_UNKNOWN_METHOD,
-                                               _("No such interface “org.freedesktop.DBus.Properties” on object at path %s"),
+                                               _("No such interface “%s” on object at path %s"),
+                                               DBUS_INTERFACE_PROPERTIES,
                                                g_dbus_message_get_path (data->message));
       g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
       g_object_unref (reply);
diff --git a/gio/gdbusmessage.c b/gio/gdbusmessage.c
index 94b241ee2..c88268bd7 100644
--- a/gio/gdbusmessage.c
+++ b/gio/gdbusmessage.c
@@ -1421,8 +1421,13 @@ validate_headers (GDBusMessage  *message,
               g_set_error (error,
                            G_IO_ERROR,
                            G_IO_ERROR_INVALID_ARGUMENT,
-                           _("%s message: PATH header field is using the reserved value /org/freedesktop/DBus/Local"),
-                           message_type_to_string (message->type));
+                           /* Translators: The first placeholder is a D-Bus message type,
+                            * the second is the name of a header field and the third is
+                            * a value that is reserved for the given field. */
+                           _("%s message: %s header field is using the reserved value %s"),
+                           message_type_to_string (message->type),
+                           "PATH",
+                           DBUS_PATH_LOCAL);
               goto out;
             }
           break;
@@ -1443,8 +1448,10 @@ validate_headers (GDBusMessage  *message,
               g_set_error (error,
                            G_IO_ERROR,
                            G_IO_ERROR_INVALID_ARGUMENT,
-                           _("%s message: INTERFACE header field is using the reserved value org.freedesktop.DBus.Local"),
-                           message_type_to_string (message->type));
+                           _("%s message: %s header field is using the reserved value %s"),
+                           message_type_to_string (message->type),
+                           "INTERFACE",
+                           DBUS_INTERFACE_LOCAL);
               goto out;
             }
           break;