diff --git a/kcms/kfontinst/dbus/FontInst.h b/kcms/kfontinst/dbus/FontInst.h
--- a/kcms/kfontinst/dbus/FontInst.h
+++ b/kcms/kfontinst/dbus/FontInst.h
@@ -28,6 +28,7 @@
 #include <QStringList>
 #include <QSet>
 #include <QDBusConnection>
+#include <QEventLoopLocker>
 #include <KJob>
 #include "Family.h"
 #include "Folder.h"
@@ -155,6 +156,10 @@
     QTimer    *itsConnectionsTimer,
               *itsFontListTimer;
     QSet<int> itsConnections;
+
+    // This is needed because KJob uses an event loop locker internally,
+    // which would otherwise cause fontinst to quit after the job is done.
+    QEventLoopLocker loopLocker;
 };
 
 }