--- a/tests/test-check-help.t	Tue Sep 18 22:40:03 2018 -0400
+++ b/tests/test-check-help.t	Tue Sep 18 23:47:21 2018 -0400
@@ -25,5 +25,5 @@
 
   $ testrepohg files 'glob:{hgdemandimport,hgext,mercurial}/**/*.py' \
   > | sed 's|\\|/|g' \
-  > | xargs $PYTHON "$TESTTMP/scanhelptopics.py" \
+  > | xargs "$PYTHON" "$TESTTMP/scanhelptopics.py" \
   > | xargs -n1 hg help --config extensions.phabricator= > /dev/null