diff --git a/src/tests/eolian_cxx/generic.eo b/src/tests/eolian_cxx/generic.eo
index a66d560df9..72722a9c6c 100644
--- a/src/tests/eolian_cxx/generic.eo
+++ b/src/tests/eolian_cxx/generic.eo
@@ -1,4 +1,4 @@
-type @extern Ecore_Cb: __undefined_type;
+import ecore_types;
 
 class Generic (Eo.Base)
 {