diff --git a/tests/test-narrow-clone-non-narrow-server.t b/tests/test-narrow-clone-non-narrow-server.t
--- a/tests/test-narrow-clone-non-narrow-server.t
+++ b/tests/test-narrow-clone-non-narrow-server.t
@@ -19,7 +19,7 @@
 
 Verify that narrow is advertised in the bundle2 capabilities:
   $ echo hello | hg -R . serve --stdio | \
-  >   python -c "import sys, urllib; print urllib.unquote_plus(list(sys.stdin)[1])" | grep narrow
+  >   $PYTHON -c "import sys, urllib; print urllib.unquote_plus(list(sys.stdin)[1])" | grep narrow
   narrow=v0
 
   $ cd ..
diff --git a/tests/test-sparse-clone.t b/tests/test-sparse-clone.t
--- a/tests/test-sparse-clone.t
+++ b/tests/test-sparse-clone.t
@@ -2,7 +2,7 @@
 
   $ cat >> $HGRCPATH << EOF
   > [ui]
-  > ssh = python "$RUNTESTDIR/dummyssh"
+  > ssh = $PYTHON "$RUNTESTDIR/dummyssh"
   > username = nobody <no.reply@fb.com>
   > [extensions]
   > sparse=