diff --git a/src/corelib/thread/qfutureinterface.cpp b/src/corelib/thread/qfutureinterface.cpp
index 0e39cd6da3..8f73dde253 100644
--- a/src/corelib/thread/qfutureinterface.cpp
+++ b/src/corelib/thread/qfutureinterface.cpp
@@ -30,6 +30,7 @@ namespace {
 class ThreadPoolThreadReleaser {
     QThreadPool *m_pool;
 public:
+    Q_NODISCARD_CTOR
     explicit ThreadPoolThreadReleaser(QThreadPool *pool)
         : m_pool(pool)
     { if (pool) pool->releaseThread(); }