diff --git a/tests/test-permissions b/tests/test-permissions
--- a/tests/test-permissions
+++ b/tests/test-permissions
@@ -14,4 +14,4 @@ chmod -w .hg/store/data/a.i
 echo barber > a
 hg commit -m "2" -d "1000000 0" 2>/dev/null || echo commit failed
 chmod -w ../t
-hg diff
+hg diff --nodates