diff --git a/include/bank.hpp b/include/bank.hpp
index 03d364d..e17e000 100644
--- a/include/bank.hpp
+++ b/include/bank.hpp
@@ -167,7 +167,6 @@ public:
                 //we know it contains this key but we call this func to grab mutex
                 temp[i++] = u.first;
             }
-            size_lock.unlock_shared();
             std::unique_lock<std::shared_mutex> lock{size_lock};
             size_lock_flag = false;
         }