--- a/Graphics/PixmapDiagram.py	Thu Mar 10 19:50:10 2016 +0100
+++ b/Graphics/PixmapDiagram.py	Thu Mar 10 20:19:33 2016 +0100
@@ -238,8 +238,8 @@
         @param scrollBar reference to the scrollbar object (QScrollBar)
         @param factor factor to adjust by (float)
         """
-        scrollBar.setValue(int(factor * scrollBar.value()
-                           + ((factor - 1) * scrollBar.pageStep() / 2)))
+        scrollBar.setValue(int(factor * scrollBar.value() +
+                           ((factor - 1) * scrollBar.pageStep() / 2)))
         
     def __levelForZoom(self, zoom):
         """