diff --git a/src/lib/ecore_con/ecore_con_base.eo b/src/lib/ecore_con/ecore_con_base.eo
index 01d15353cd..ab8049b531 100644
--- a/src/lib/ecore_con/ecore_con_base.eo
+++ b/src/lib/ecore_con/ecore_con_base.eo
@@ -1,3 +1,5 @@
+type Ecore_Con_Dns_Cb: __undefined_type;
+
 abstract Ecore.Con.Base (Eo.Base) {
    legacy_prefix: ecore_con;
    eo_prefix: ecore_con_obj;