diff --git a/ui/presentationwidget.cpp b/ui/presentationwidget.cpp
index a414282af..bbf4a3c09 100644
--- a/ui/presentationwidget.cpp
+++ b/ui/presentationwidget.cpp
@@ -194,14 +194,14 @@ void PresentationWidget::wheelEvent( QWheelEvent * e )
         if ( div > 3 )
             div = 3;
         while ( div-- )
-            slotNextPage();
+            slotPrevPage();
     }
     else if ( div < 0 )
     {
         if ( div < -3 )
             div = -3;
         while ( div++ )
-            slotPrevPage();
+            slotNextPage();
     }
 }