diff --git a/compiler2/ttcn3/TtcnTemplate.cc b/compiler2/ttcn3/TtcnTemplate.cc
index d30c86dfd32d43dccbee6cd7a8e45d99deba8ec7..e9d02f7b6f721f145e5bca072278e4d38e1b1924 100644
--- a/compiler2/ttcn3/TtcnTemplate.cc
+++ b/compiler2/ttcn3/TtcnTemplate.cc
@@ -4098,7 +4098,7 @@ compile_time:
           str = t->generate_code_init(str, embedded_name);
           Free(embedded_name);
         }
-        Free(fieldname_str);
+        Free(const_cast<char*>(fieldname_str));
       }
     } else {
       str = mputprintf(str, "%s = NULL_VALUE;\n", name);