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-rw-r--r--src/pdf/api/qpdfdocument_p.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/pdf/api/qpdfdocument_p.h b/src/pdf/api/qpdfdocument_p.h
index 9a737766b..b6ee2dfd0 100644
--- a/src/pdf/api/qpdfdocument_p.h
+++ b/src/pdf/api/qpdfdocument_p.h
@@ -58,9 +58,11 @@
#include <QtCore/qpointer.h>
#include <QtNetwork/qnetworkreply.h>
+#include <mutex>
+
QT_BEGIN_NAMESPACE
-class QPdfMutexLocker : public QMutexLocker
+class QPdfMutexLocker : public std::unique_lock<QRecursiveMutex>
{
public:
QPdfMutexLocker();