diff --git a/src/gen_cpp_Engine.ysl2 b/src/gen_cpp_Engine.ysl2
index 326f714..92128ae 100644
--- a/src/gen_cpp_Engine.ysl2
+++ b/src/gen_cpp_Engine.ysl2
@@ -227,7 +227,7 @@ tstylesheet {
     }
 
     function "mangle" {
-        const "convert", "count(parm/stringlist|parm/string|parm/identity) > 0";
+        const "convert", "count(parm/stringlist|parm/string|parm/identity|parm/identitylist) > 0";
 
         choose {
             when "$convert"