diff --git a/gtk/gtkapplication.c b/gtk/gtkapplication.c
index 5e55b8c961..61035b595b 100644
--- a/gtk/gtkapplication.c
+++ b/gtk/gtkapplication.c
@@ -1545,6 +1545,14 @@ gtk_application_get_action_muxer (GtkApplication *application)
   return application->priv->muxer;
 }
 
+void
+gtk_application_insert_action_group (GtkApplication *application,
+                                     const gchar    *name,
+                                     GActionGroup   *action_group)
+{
+  gtk_action_muxer_insert (application->priv->muxer, name, action_group);
+}
+
 void
 gtk_application_handle_window_realize (GtkApplication *application,
                                        GtkWindow      *window)
diff --git a/gtk/gtkapplicationprivate.h b/gtk/gtkapplicationprivate.h
index 7847fcfb22..3ba26d5c17 100644
--- a/gtk/gtkapplicationprivate.h
+++ b/gtk/gtkapplicationprivate.h
@@ -53,6 +53,10 @@ void                    gtk_application_foreach_accel_keys              (GtkAppl
                                                                          gpointer                  user_data);
 G_GNUC_INTERNAL
 GtkActionMuxer *        gtk_application_get_action_muxer                (GtkApplication           *application);
+G_GNUC_INTERNAL
+void                    gtk_application_insert_action_group             (GtkApplication           *application,
+                                                                         const gchar              *name,
+                                                                         GActionGroup             *action_group);
 
 
 #define GTK_TYPE_APPLICATION_IMPL                           (gtk_application_impl_get_type ())