1 files changed, 1 insertions, 1 deletions
diff --git a/struct.c b/struct.c
index aa6b86d1..2f643dae 100644
--- a/struct.c
+++ b/struct.c
@@ -439,7 +439,7 @@ val make_struct_type(val name, val supers,
 
   lisplib_try_load(name);
 
-  if (builtin_type_p(name) || cobj_class_exists(name))
+  if (built_in_type_p(name))
     uw_throwf(error_s, lit("~a: ~s is a built-in type"),
               self, name, nao);