diff --git a/src/gtkport/itemfactory.c b/src/gtkport/itemfactory.c
index b7a8c3f..980682c 100644
--- a/src/gtkport/itemfactory.c
+++ b/src/gtkport/itemfactory.c
@@ -217,7 +217,7 @@ void dp_gtk_item_factory_create_item(DPGtkItemFactory *ifactory,
   new_child->widget = menu_item;
   if (entry->callback) {
     g_signal_connect(G_OBJECT(menu_item), "activate",
-                     entry->callback, callback_data);
+                     G_CALLBACK(entry->callback), callback_data);
   }
 
   if (parent) {
diff --git a/src/gtkport/itemfactory.h b/src/gtkport/itemfactory.h
index a1d5b1d..2702595 100644
--- a/src/gtkport/itemfactory.h
+++ b/src/gtkport/itemfactory.h
@@ -59,7 +59,7 @@ GtkItemFactory *dp_gtk_item_factory_new(const gchar *path,
 
 typedef gchar *(*DPGtkTranslateFunc) (const gchar *path, gpointer func_data);
 
-typedef void (*DPGtkItemFactoryCallback) ();
+typedef void (*DPGtkItemFactoryCallback) (GtkWidget *widget, gpointer data);
 
 typedef struct _DPGtkItemFactoryEntry DPGtkItemFactoryEntry;
 typedef struct _DPGtkItemFactory DPGtkItemFactory;