1 files changed, 2 insertions, 3 deletions
diff --git a/hash.c b/hash.c
index 5405410fd1..e80051e737 100644
--- a/hash.c
+++ b/hash.c
@@ -1015,12 +1015,11 @@ VALUE
 rb_hash_aset(VALUE hash, VALUE key, VALUE val)
 {
     rb_hash_modify(hash);
-    if (RHASH(hash)->ntbl->type == &identhash ||
-	rb_obj_class(key) != rb_cString || st_lookup(RHASH(hash)->ntbl, key, 0)) {
+    if (RHASH(hash)->ntbl->type == &identhash || rb_obj_class(key) != rb_cString) {
 	st_insert(RHASH(hash)->ntbl, key, val);
     }
     else {
-	st_add_direct(RHASH(hash)->ntbl, rb_str_new4(key), val);
+	st_insert2(RHASH(hash)->ntbl, key, val, rb_str_new4);
     }
     return val;
 }