diff --git a/src/mzscheme/src/hash.c b/src/mzscheme/src/hash.c
index 39e187f0da..ea52d1effa 100644
--- a/src/mzscheme/src/hash.c
+++ b/src/mzscheme/src/hash.c
@@ -773,6 +773,7 @@ void scheme_init_hash_key_procs(void)
   PROC(scheme_prim_type, hash_prim);
   PROC(scheme_closed_prim_type, hash_prim);
   PROC(scheme_closure_type, hash_general);
+  PROC(scheme_native_closure_type, hash_general);
   PROC(scheme_case_closure_type, hash_case);
   PROC(scheme_cont_type, hash_general);
   PROC(scheme_escaping_cont_type, hash_general);