--- a/tests/test-diff-newlines.t	Tue Sep 18 22:40:03 2018 -0400
+++ b/tests/test-diff-newlines.t	Tue Sep 18 23:47:21 2018 -0400
@@ -1,6 +1,6 @@
   $ hg init
 
-  $ $PYTHON -c 'open("a", "wb").write(b"confuse str.splitlines\nembedded\rnewline\n")'
+  $ "$PYTHON" -c 'open("a", "wb").write(b"confuse str.splitlines\nembedded\rnewline\n")'
   $ hg ci -Ama -d '1 0'
   adding a