diff --git a/kdecore/io/klockfile_unix.cpp b/kdecore/io/klockfile_unix.cpp
index 83741ba0..c4574144 100644
--- a/kdecore/io/klockfile_unix.cpp
+++ b/kdecore/io/klockfile_unix.cpp
@@ -22,6 +22,7 @@
 #include "kdebug.h"
 #include "kde_file.h"
 
+#include <QCryptographicHash>
 #include <QCoreApplication>
 #include <QThread>
 
@@ -51,7 +52,7 @@ KLockFile::KLockFile(const QString &file)
     : d(new KLockFilePrivate())
 {
     d->m_lockfile = QFile::encodeName(KGlobal::dirs()->saveLocation("tmp"));
-    d->m_lockfile.append(QFile::encodeName(file).toHex());
+    d->m_lockfile.append(QCryptographicHash::hash(QFile::encodeName(file), QCryptographicHash::KAT).toHex());
     d->m_lockfile.append(".klockfile");
 }