--- a/tests/test-extension.t	Wed Jul 05 11:09:55 2017 -0500
+++ b/tests/test-extension.t	Wed Jul 05 11:10:11 2017 -0500
@@ -123,7 +123,7 @@
   > EOF
   $ . "$TESTDIR/cgienv"
 
-  $ PATH_INFO='/' SCRIPT_NAME='' python hgweb.cgi \
+  $ PATH_INFO='/' SCRIPT_NAME='' $PYTHON hgweb.cgi \
   >    | grep '^[0-9]) ' # ignores HTML output
   1) foo imported
   1) bar imported