diff --git a/tests/test-revert-unknown b/tests/test-revert-unknown
--- a/tests/test-revert-unknown
+++ b/tests/test-revert-unknown
@@ -5,11 +5,11 @@ touch unknown
 
 touch a
 hg add a
-hg ci -m "1" -d "0 0"
+hg ci -m "1" -d "1000000 0"
 
 touch b
 hg add b
-hg ci -m "2" -d "0 0"
+hg ci -m "2" -d "1000000 0"
 
 echo %% Should show unknown
 hg status