Clear an intermediate hash [Bug #17735]

1 files changed, 1 insertions, 0 deletions

diff --git a/hash.c b/hash.c
index d6d3752fb7..00beadfad4 100644
--- a/hash.c
+++ b/hash.c
@@ -3292,6 +3292,7 @@ rb_hash_transform_keys_bang(int argc, VALUE *argv, VALUE hash)
             rb_hash_aset(hash, new_key, val);
             rb_hash_aset(new_keys, new_key, Qnil);
         }
+        rb_hash_clear(new_keys);
     }
     return hash;
 }