diff --git a/racket/src/racket/src/eval.c b/racket/src/racket/src/eval.c
index f3d5786c66..3fa15870fa 100644
--- a/racket/src/racket/src/eval.c
+++ b/racket/src/racket/src/eval.c
@@ -2448,7 +2448,11 @@ scheme_make_closure(Scheme_Thread *p, Scheme_Object *code, int close)
   data = (Scheme_Closure_Data *)code;
   
 #ifdef MZ_USE_JIT
-  if (data->u.native_code) {
+  if (data->u.native_code
+      /* If the union points to a another Scheme_Closure_Data*, then it's not actually
+         a pointer to native code. We must have a closure referenced frmo non-JITted code
+         where the closure is also referenced by JITted code. */
+      && !SAME_TYPE(SCHEME_TYPE(data->u.native_code), scheme_unclosed_procedure_type)) {
     Scheme_Object *nc;
 
     nc = scheme_make_native_closure(data->u.native_code);