diff --git a/tests/test-merge4 b/tests/test-merge4
--- a/tests/test-merge4
+++ b/tests/test-merge4
@@ -3,15 +3,15 @@
 hg init
 echo This is file a1 > a
 hg add a
-hg commit -m "commit #0" -d "0 0"
+hg commit -m "commit #0" -d "1000000 0"
 echo This is file b1 > b
 hg add b
-hg commit -m "commit #1" -d "0 0"
+hg commit -m "commit #1" -d "1000000 0"
 hg update 0
 echo This is file c1 > c
 hg add c
-hg commit -m "commit #2" -d "0 0"
+hg commit -m "commit #2" -d "1000000 0"
 hg update -m 1
 rm b
 echo This is file c22 > c
-hg commit -m "commit #3" -d "0 0"
+hg commit -m "commit #3" -d "1000000 0"