diff --git a/t/t1100-commit-tree-options.sh b/t/t1100-commit-tree-options.sh
index a3b77239f4..f8457f9d14 100755
--- a/t/t1100-commit-tree-options.sh
+++ b/t/t1100-commit-tree-options.sh
@@ -47,6 +47,7 @@ test_expect_success \
 
 
 test_expect_success 'flags and then non flags' '
+	test_tick &&
 	echo comment text |
 	git commit-tree $(cat treeid) >commitid &&
 	echo comment text |