diff --git a/test_runner/regress/test_import.py b/test_runner/regress/test_import.py
index 743fa72aba..695d32edf7 100644
--- a/test_runner/regress/test_import.py
+++ b/test_runner/regress/test_import.py
@@ -252,6 +252,7 @@ def _import(
     # Import using another tenant_id, because we use the same pageserver.
     # TODO Create another pageserver to make test more realistic.
     tenant = TenantId.generate()
+    timeline = TimelineId.generate()
 
     # Import to pageserver
     branch_name = "import_from_pageserver"