diff --git a/.gitignore b/.gitignore
index 9bca061..b857371 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,7 @@ ui_*.h
 *.jsc
 Makefile*
 *build-*
+*build_*
 
 # Qt unit tests
 target_wrapper.*
diff --git a/src/libipc/waiter.h b/src/libipc/waiter.h
index ee45fe3..bb5b3b3 100644
--- a/src/libipc/waiter.h
+++ b/src/libipc/waiter.h
@@ -64,12 +64,16 @@ public:
     }
 
     bool notify() noexcept {
-        std::lock_guard<ipc::sync::mutex>{lock_}; // barrier
+        {
+            IPC_UNUSED_ std::lock_guard<ipc::sync::mutex> barrier{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> barrier{lock_}; // barrier
+        }
         return cond_.broadcast(lock_);
     }