diff --git a/cylc/uiserver/data_store_mgr.py b/cylc/uiserver/data_store_mgr.py
index 94059fa1..796ae314 100644
--- a/cylc/uiserver/data_store_mgr.py
+++ b/cylc/uiserver/data_store_mgr.py
@@ -48,6 +48,7 @@
     apply_delta, generate_checksum, create_delta_store
 )
 from cylc.flow.suite_files import ContactFileFields as CFF
+from cylc.flow.network.suite_status import SuiteStatus
 
 from .workflows_mgr import workflow_request
 
@@ -90,7 +91,7 @@ def update_contact(self, w_id, contact_data=None):
             flow.port = 0
             # flow.pub_port = 0
             flow.api_version = 0
-            flow.status = 'stopped'
+            flow.status = SuiteStatus.Stopped.value
 
         # Apply to existing workflow data
         apply_delta(WORKFLOW, delta, self.data[w_id])