diff --git a/src/libipc/waiter.h b/src/libipc/waiter.h
index 2e13dc3..ce4e592 100644
--- a/src/libipc/waiter.h
+++ b/src/libipc/waiter.h
@@ -62,12 +62,12 @@ public:
     }
 
     bool notify() noexcept {
-        std::lock_guard<ipc::sync::mutex>{lock_}; // barrier
+        { IPC_UNUSED_ std::lock_guard<ipc::sync::mutex> guard{lock_}; } // barrier
         return cond_.notify(lock_);
     }
 
     bool broadcast() noexcept {
-        std::lock_guard<ipc::sync::mutex>{lock_}; // barrier
+        { IPC_UNUSED_ std::lock_guard<ipc::sync::mutex> guard{lock_}; } // barrier
         return cond_.broadcast(lock_);
     }