diff --git a/cfg/gtk.cfg b/cfg/gtk.cfg
index cd5218b75..9e3669324 100644
--- a/cfg/gtk.cfg
+++ b/cfg/gtk.cfg
@@ -18,6 +18,7 @@
   <define name="GTK_ENTRY(obj)" value="((GtkEntry*)(obj))"/>
   <define name="GTK_OBJECT(obj)" value="((GtkObject*)(obj))"/>
   <define name="GTK_LABEL(obj)" value="((GtkLabel*)(obj))"/>
+  <define name="GTK_DIALOG(obj)" value="((GtkDialog*)(obj))"/>
   <define name="GTK_TABLE(obj)" value="((GtkTable*)(obj))"/>
   <define name="GTK_TREE_VIEW(obj)" value="((GtkTreeView*)(obj))"/>
   <define name="GTK_TOGGLE_BUTTON(obj)" value="((GtkToggleButton*)(obj))"/>