diff --git a/src/core/lvmdevice.cpp b/src/core/lvmdevice.cpp
index f94e3fb..0a20cba 100644
--- a/src/core/lvmdevice.cpp
+++ b/src/core/lvmdevice.cpp
@@ -53,7 +53,7 @@ LvmDevice::LvmDevice(const QString& vgName, const QString& iconName)
     m_allocPE = m_totalPE - m_freePE;
     m_UUID    = getUUID(vgName);
     m_LVPathList = new QStringList(getLVs(vgName));
-    m_LVSizeMap  = new QMap<QString, qint64>();
+    m_LVSizeMap  = new QHash<QString, qint64>();
 
     initPartitions();
 }
diff --git a/src/core/lvmdevice.h b/src/core/lvmdevice.h
index 0698f57..66c00d2 100644
--- a/src/core/lvmdevice.h
+++ b/src/core/lvmdevice.h
@@ -24,6 +24,7 @@
 #include "core/volumemanagerdevice.h"
 #include "util/libpartitionmanagerexport.h"
 
+#include <QHash>
 #include <QString>
 #include <QObject>
 #include <QtGlobal>
@@ -120,7 +121,7 @@ public:
     }
 
 protected:
-    QMap<QString, qint64>* LVSizeMap() const {
+    QHash<QString, qint64>* LVSizeMap() const {
         return m_LVSizeMap;
     }
 
@@ -133,7 +134,8 @@ private:
 
     mutable QStringList* m_LVPathList;
     QList <const Partition*> m_PVs;
-    mutable QMap<QString, qint64>* m_LVSizeMap;
+    mutable QHash<QString, qint64>* m_LVSizeMap;
+
 };
 
 #endif