diff --git a/modules/base/pymod/stutil.py b/modules/base/pymod/stutil.py
index 7401e62cba19cdfac661e20b0592d23737de80ff..474861c88e9e6586e947cfae7af348d85fb6ee54 100644
--- a/modules/base/pymod/stutil.py
+++ b/modules/base/pymod/stutil.py
@@ -56,7 +56,7 @@ def Median(xs):
     raise RuntimeError("Can't calculate median of empty sequence")
   sorted_xs=sorted(xs)
   if (len(xs) % 2)==0:
-    return (sorted_xs[len(xs)/2]+sorted_xs[len(xs)/2]+1)/2
+    return (sorted_xs[len(xs)/2]+sorted_xs[len(xs)/2+1])/2
   else:
     return sorted_xs[len(xs)/2]