diff --git a/lib/galaxy/workflow/scheduling_manager.py b/lib/galaxy/workflow/scheduling_manager.py
index 53216bffe8c..0abc7b4b1c6 100644
--- a/lib/galaxy/workflow/scheduling_manager.py
+++ b/lib/galaxy/workflow/scheduling_manager.py
@@ -177,7 +177,7 @@ class WorkflowSchedulingManager(ConfiguresHandlers):
         self,
         workflow_invocation: model.WorkflowInvocation,
         request_params,
-        flush=True,
+        flush: bool = True,
         initial_state: Optional[InvocationState] = None,
     ):
         initial_state = initial_state or model.WorkflowInvocation.states.NEW