diff --git a/cylc/uiserver/resolvers.py b/cylc/uiserver/resolvers.py
index 73f00f8d..e1e85e47 100644
--- a/cylc/uiserver/resolvers.py
+++ b/cylc/uiserver/resolvers.py
@@ -546,7 +546,7 @@ async def service(
         kwargs: Dict[str, Any],
     ) -> List[Union[bool, str]]:
 
-        if command == 'clean': # noqa: SIM116
+        if command == 'clean':  # noqa: SIM116
             return await Services.clean(
                 workflows,
                 kwargs,