diff --git a/dlls/oleaut32/typelib.c b/dlls/oleaut32/typelib.c
index ce3a1dccc05..ccb58293e3d 100644
--- a/dlls/oleaut32/typelib.c
+++ b/dlls/oleaut32/typelib.c
@@ -597,7 +597,7 @@ HRESULT WINAPI RegisterTypeLib(
 			MESSAGE("\n");
 		    }
 
-		    if (tattr->wTypeFlags & (TYPEFLAG_FOLEAUTOMATION|TYPEFLAG_FDISPATCHABLE))
+		    if (tattr->wTypeFlags & (TYPEFLAG_FOLEAUTOMATION|TYPEFLAG_FDUAL|TYPEFLAG_FDISPATCHABLE))
 		    {
 			/* register interface<->typelib coupling */
 			get_interface_key( &tattr->guid, keyName );