diff --git a/tests/test-copies-chain-merge.t b/tests/test-copies-chain-merge.t
index dfbdd8b2..b2662e6f 100644
--- a/tests/test-copies-chain-merge.t
+++ b/tests/test-copies-chain-merge.t
@@ -1,8 +1,9 @@
+#require slow
 #testcases filelog compatibility changeset sidedata upgraded upgraded-parallel pull push pull-upgrade push-upgrade
 
 =====================================================
 Test Copy tracing for chain of copies involving merge
 =====================================================
 
 This test files covers copies/rename case for a chains of commit where merges
 are involved. It cheks we do not have unwanted update of behavior and that the