diff --git a/tests/test-check-code-hg.t b/tests/test-check-code-hg.t
--- a/tests/test-check-code-hg.t
+++ b/tests/test-check-code-hg.t
@@ -26,6 +26,5 @@ Prepare check for Python files without p
 
 New errors are not allowed. Warnings are strongly discouraged.
 
-  $ { hg manifest 2>/dev/null; ls "$TESTTMP"/*.py; } \
-  >   | xargs "$check_code" --warnings --per-file=0 \
-  >   || false
+  $ { hg manifest 2>/dev/null; ls "$TESTTMP"/*.py | sed 's-\\-/-g'; } |
+  >   xargs "$check_code" --warnings --per-file=0 || false