diff --git a/src/lib/ecore/ecore_types.eot b/src/lib/ecore/ecore_types.eot
index f1d7191afc..dce626004a 100644
--- a/src/lib/ecore/ecore_types.eot
+++ b/src/lib/ecore/ecore_types.eot
@@ -1,3 +1,4 @@
+type @extern Ecore_Cb: __undefined_type;
 type @extern Ecore_Task_Cb: __undefined_type;
 
 enum Ecore.Pos_Map