diff --git a/tests/library.sh b/tests/library.sh
--- a/tests/library.sh
+++ b/tests/library.sh
@@ -16,6 +16,8 @@
 preferuncompressed=True
 [experimental]
 changegroup3=True
+[rebase]
+singletransaction=True
 EOF
 
 hgcloneshallow() {