diff --git a/tests/test-undo b/tests/test-undo
--- a/tests/test-undo
+++ b/tests/test-undo
@@ -5,7 +5,7 @@ cd t
 hg init
 echo a > a
 hg add a
-hg commit -m "test" -d "0 0"
+hg commit -m "test" -d "1000000 0"
 hg verify
 hg parents
 hg status