diff --git a/swig/ResTraits.i b/swig/ResTraits.i
index cbcefad..638fded 100644
--- a/swig/ResTraits.i
+++ b/swig/ResTraits.i
@@ -1,3 +1,4 @@
+%include <zypp/ResObject.h>
 
 /** Base of ResTraits. Defines the Resolvable::Kind type. */
 /*struct ResolvableTraits