diff --git a/gtk/gtkactionmuxer.c b/gtk/gtkactionmuxer.c
index f74a65367a..8810ffb921 100644
--- a/gtk/gtkactionmuxer.c
+++ b/gtk/gtkactionmuxer.c
@@ -1052,20 +1052,6 @@ gtk_action_muxer_remove (GtkActionMuxer *muxer,
     }
 }
 
-GActionGroup *
-gtk_action_muxer_lookup (GtkActionMuxer *muxer,
-                         const gchar    *prefix)
-{
-  Group *group;
-
-  group = g_hash_table_lookup (muxer->groups, prefix);
-
-  if (group != NULL)
-    return group->group;
-
-  return NULL;
-}
-
 /*< private >
  * gtk_action_muxer_new:
  * @widget: the widget to which the muxer belongs
diff --git a/gtk/gtkactionmuxerprivate.h b/gtk/gtkactionmuxerprivate.h
index 44dbb8a404..a37d30cf7e 100644
--- a/gtk/gtkactionmuxerprivate.h
+++ b/gtk/gtkactionmuxerprivate.h
@@ -54,8 +54,6 @@ void                    gtk_action_muxer_insert                         (GtkActi
 
 void                    gtk_action_muxer_remove                         (GtkActionMuxer *muxer,
                                                                          const gchar    *prefix);
-GActionGroup *          gtk_action_muxer_lookup                         (GtkActionMuxer *muxer,
-                                                                         const gchar    *prefix);
 GActionGroup *          gtk_action_muxer_find                           (GtkActionMuxer *muxer,
                                                                          const char     *action_name,
                                                                          const char    **unprefixed_name);