diff -r cad62cb3c84c -r 75be14993fda tests/test-convert-bzr-treeroot.t
--- a/tests/test-convert-bzr-treeroot.t	Thu Jun 15 14:22:39 2017 -0400
+++ b/tests/test-convert-bzr-treeroot.t	Tue Jun 20 09:45:02 2017 -0400
@@ -20,7 +20,7 @@
   $ echo content > file
   $ bzr add -q file
   $ bzr commit -q -m 'Initial add'
-  $ python ../../treeset.py 'Changed root' new
+  $ $PYTHON ../../treeset.py 'Changed root' new
   $ cd ..
   $ hg convert source source-hg
   initializing destination source-hg repository