diff --git a/server/IptablesRestoreController.cpp b/server/IptablesRestoreController.cpp
index 88d88f6..eb67b75 100644
--- a/server/IptablesRestoreController.cpp
+++ b/server/IptablesRestoreController.cpp
@@ -347,7 +347,7 @@
 
 int IptablesRestoreController::execute(const IptablesTarget target, const std::string& command,
                                        std::string *output) {
-    std::lock_guard<std::mutex> lock(mLock);
+    std::lock_guard lock(mLock);
 
     std::string buffer;
     if (output == nullptr) {