--- a/tests/test-convert-clonebranches.t	Tue Sep 18 22:40:03 2018 -0400
+++ b/tests/test-convert-clonebranches.t	Tue Sep 18 23:47:21 2018 -0400
@@ -42,7 +42,7 @@
 convert
 
   $ hg convert -v --config convert.hg.clonebranches=1 source dest |
-  >     $PYTHON filter.py
+  >     "$PYTHON" filter.py
   3 adda
   2 changea
   1 addb
@@ -75,7 +75,7 @@
 incremental conversion
 
   $ hg convert -v --config convert.hg.clonebranches=1 source dest |
-  >     $PYTHON filter.py
+  >     "$PYTHON" filter.py
   2 c1
   pulling from branch0 into branch1
   4 changesets found