diff --git a/lib/src/ListenerManager.cc b/lib/src/ListenerManager.cc
index 837da953..4b52079c 100644
--- a/lib/src/ListenerManager.cc
+++ b/lib/src/ListenerManager.cc
@@ -34,7 +34,7 @@ class DrogonFileLocker : public trantor::NonCopyable
   public:
     DrogonFileLocker()
     {
-        fd_ = open("/tmp/drogon.lock", O_TRUNC | O_CREAT, 0755);
+        fd_ = open("/tmp/drogon.lock", O_TRUNC | O_CREAT, 0666);
         flock(fd_, LOCK_EX);
     }
     ~DrogonFileLocker()
@@ -269,4 +269,4 @@ std::vector<trantor::InetAddress> ListenerManager::getListeners() const
         listeners.emplace_back(server->address());
     }
     return listeners;
-}
\ No newline at end of file
+}