1 files changed, 1 insertions, 1 deletions
diff --git a/hash.c b/hash.c
index 60c491f14e..d616e8e90e 100644
--- a/hash.c
+++ b/hash.c
@@ -2496,7 +2496,7 @@ rb_hash_update_by(VALUE hash1, VALUE hash2, rb_hash_update_func *func)
 static VALUE
 rb_hash_merge(VALUE hash1, VALUE hash2)
 {
-    return rb_hash_update(rb_obj_dup(hash1), hash2);
+    return rb_hash_update(rb_hash_dup(hash1), hash2);
 }
 
 static int