diff --git a/base/include/safe_map.h b/base/include/safe_map.h
index 9c1ca396a752bd64c2633f86f7ecf7509ce66f0b..cf010005208079860d86496329349e930d9e9e66 100644
--- a/base/include/safe_map.h
+++ b/base/include/safe_map.h
@@ -45,11 +45,6 @@ public:
         return *this;
     }
 
-    V& operator[](const K& key)
-    {
-        return map_[key];
-    }
-
     V ReadVal(const K& key)
     {
         std::lock_guard<std::mutex> lock(mutex_);