--- a/tests/test-contrib.t	Wed Oct 15 15:13:43 2014 -0400
+++ b/tests/test-contrib.t	Wed Oct 15 15:35:59 2014 -0400
@@ -207,7 +207,7 @@
 
 binary file
 
-  $ python -c "f = file('binary-local', 'w'); f.write('\x00'); f.close()"
+  $ $PYTHON -c "f = file('binary-local', 'w'); f.write('\x00'); f.close()"
   $ cat orig >> binary-local
   $ python simplemerge -p binary-local base other
   warning: binary-local looks like a binary file.