diff --git a/src/lj_lib.c b/src/lj_lib.c
index 21e6a61d..438056d8 100644
--- a/src/lj_lib.c
+++ b/src/lj_lib.c
@@ -342,6 +342,8 @@ int32_t lj_lib_checkintrange(lua_State *L, int narg, int32_t a, int32_t b)
       } else if (cd->ctypeid == CTID_UINT64) {
 	uint64_t i = *(uint64_t *)cdataptr(cd);
 	if ((a < 0 || i >= (uint64_t)a) && i <= (uint64_t)b) return (int32_t)i;
+      } else {
+	goto badtype;
       }
 #endif
     } else {