diff --git a/core/generator.cpp b/core/generator.cpp
index 9e43375a9..3da0b5ae1 100644
--- a/core/generator.cpp
+++ b/core/generator.cpp
@@ -41,7 +41,7 @@ using namespace Okular;
 GeneratorPrivate::GeneratorPrivate()
     : m_document( nullptr ),
       mPixmapGenerationThread( nullptr ), mTextPageGenerationThread( nullptr ),
-      m_mutex( nullptr ), m_threadsMutex( nullptr ), mPixmapReady( true ), mTextPageReady( true ),
+      mPixmapReady( true ), mTextPageReady( true ),
       m_closing( false ), m_closingLoop( nullptr ),
       m_dpi(72.0, 72.0)
 {
@@ -59,9 +59,6 @@ GeneratorPrivate::~GeneratorPrivate()
         mTextPageGenerationThread->wait();
 
     delete mTextPageGenerationThread;
-
-    delete m_mutex;
-    delete m_threadsMutex;
 }
 
 PixmapGenerationThread* GeneratorPrivate::pixmapGenerationThread()
@@ -163,9 +160,7 @@ void GeneratorPrivate::textpageGenerationFinished()
 
 QMutex* GeneratorPrivate::threadsLock()
 {
-    if ( !m_threadsMutex )
-        m_threadsMutex = new QMutex();
-    return m_threadsMutex;
+    return &m_threadsMutex;
 }
 
 QVariant GeneratorPrivate::metaData( const QString &, const QVariant & ) const
@@ -508,11 +503,7 @@ QVariant Generator::documentMetaData( const DocumentMetaDataKey key, const QVari
 QMutex* Generator::userMutex() const
 {
     Q_D( const Generator );
-    if ( !d->m_mutex )
-    {
-        d->m_mutex = new QMutex();
-    }
-    return d->m_mutex;
+    return &d->m_mutex;
 }
 
 void Generator::updatePageBoundingBox( int page, const NormalizedRect & boundingBox )
diff --git a/core/generator_p.h b/core/generator_p.h
index 239be0a79..e5854c81f 100644
--- a/core/generator_p.h
+++ b/core/generator_p.h
@@ -15,12 +15,12 @@
 
 #include "area.h"
 
+#include <QMutex>
 #include <QSet>
 #include <QThread>
 #include <QImage>
 
 class QEventLoop;
-class QMutex;
 
 #include "generator.h"
 #include "page.h"
@@ -65,8 +65,8 @@ class GeneratorPrivate
         QSet< int > m_features;
         PixmapGenerationThread *mPixmapGenerationThread;
         TextPageGenerationThread *mTextPageGenerationThread;
-        mutable QMutex *m_mutex;
-        QMutex *m_threadsMutex;
+        mutable QMutex m_mutex;
+        QMutex m_threadsMutex;
         bool mPixmapReady : 1;
         bool mTextPageReady : 1;
         bool m_closing : 1;