1 files changed, 3 insertions, 0 deletions
diff --git a/src/corelib/thread/qfutureinterface.cpp b/src/corelib/thread/qfutureinterface.cpp
index 3146a6d6fa..6690f28556 100644
--- a/src/corelib/thread/qfutureinterface.cpp
+++ b/src/corelib/thread/qfutureinterface.cpp
@@ -199,16 +199,19 @@ void QFutureInterfaceBase::waitForResume()
 
 int QFutureInterfaceBase::progressValue() const
 {
+    const QMutexLocker lock(&d->m_mutex);
     return d->m_progressValue;
 }
 
 int QFutureInterfaceBase::progressMinimum() const
 {
+    const QMutexLocker lock(&d->m_mutex);
     return d->m_progressMinimum;
 }
 
 int QFutureInterfaceBase::progressMaximum() const
 {
+    const QMutexLocker lock(&d->m_mutex);
     return d->m_progressMaximum;
 }