diff --git a/ui/thumbnaillist.cpp b/ui/thumbnaillist.cpp
index 35fe76eed..2602da1c8 100644
--- a/ui/thumbnaillist.cpp
+++ b/ui/thumbnaillist.cpp
@@ -129,7 +129,7 @@ class ThumbnailWidget
 
 ThumbnailListPrivate::ThumbnailListPrivate( ThumbnailList *qq, Okular::Document *document )
     : QWidget(), q( qq ), m_document( document ), m_selected( 0 ),
-    m_delayTimer( 0 ), m_bookmarkOverlay( 0 )
+    m_delayTimer( 0 ), m_bookmarkOverlay( 0 ), m_vectorIndex( 0 )
 {
     setMouseTracking( true );
     mouseGrabItem = 0;