diff --git a/src/widgets/dialogs/qfileinfogatherer.cpp b/src/widgets/dialogs/qfileinfogatherer.cpp
index 0f12c2b80e..c06ef0c474 100644
--- a/src/widgets/dialogs/qfileinfogatherer.cpp
+++ b/src/widgets/dialogs/qfileinfogatherer.cpp
@@ -94,7 +94,9 @@ QFileInfoGatherer::QFileInfoGatherer(QObject *parent)
 QFileInfoGatherer::~QFileInfoGatherer()
 {
     abort.store(true);
+    QMutexLocker locker(&mutex);
     condition.wakeAll();
+    locker.unlock();
     wait();
 }