diff --git a/compiler2/ttcn3/AST_ttcn3.cc b/compiler2/ttcn3/AST_ttcn3.cc
index 650c29264d5c21b6eee02d984853f347727b5ac2..5dbd399e4bc320c534265f68b958ba6c360cb2bd 100644
--- a/compiler2/ttcn3/AST_ttcn3.cc
+++ b/compiler2/ttcn3/AST_ttcn3.cc
@@ -556,7 +556,7 @@ namespace Ttcn {
   // =================================
 
   Reference::Reference(Identifier *p_id)
-    : Ref_base(), parlist(0)
+    : Ref_base(), parlist(0), gen_const_prefix(false)
   {
     subrefs.add(new FieldOrArrayRef(p_id));
   }