diff --git a/Lib/lib-tk/turtle.py b/Lib/lib-tk/turtle.py
index fcde9af4ed4..6bc3760947b 100644
--- a/Lib/lib-tk/turtle.py
+++ b/Lib/lib-tk/turtle.py
@@ -762,7 +762,7 @@ def setup(**geometry):
 
     startx = geometry.get('startx', _startx)
     if startx >= 0 or startx == None:
-        _startx = _startx
+        _startx = startx
     else:
         raise ValueError, "startx can not be less than 0"