diff --git a/ecmascript/mem/mem_map_allocator.h b/ecmascript/mem/mem_map_allocator.h
index 77a0013d793c7efc4c80f0ff15bf31d3cd67ea8e..36dd9f18c6658465e5d645aa63ca5604bba2c0c5 100644
--- a/ecmascript/mem/mem_map_allocator.h
+++ b/ecmascript/mem/mem_map_allocator.h
@@ -127,6 +127,7 @@ public:
 
     void InsertMemMap(MemMap memMap)
     {
+        os::memory::LockHolder lock(lock_);
         memMapVector_.emplace_back(memMap);
     }