1 files changed, 1 insertions, 1 deletions
diff --git a/hash.c b/hash.c
index b666fd156f..878e215dc5 100644
--- a/hash.c
+++ b/hash.c
@@ -2426,7 +2426,7 @@ rb_hash_invert_i(VALUE key, VALUE value, VALUE hash)
 static VALUE
 rb_hash_invert(VALUE hash)
 {
-    VALUE h = rb_hash_new();
+    VALUE h = rb_hash_new_with_size(RHASH_SIZE(hash));
 
     rb_hash_foreach(hash, rb_hash_invert_i, h);
     return h;