diff --git a/authority/src/lib.rs b/authority/src/lib.rs
index babd6369e23a757ad7fab214441155a65520a841..6f889cccd567e6525173ee268b7793cd35e6e259 100644
--- a/authority/src/lib.rs
+++ b/authority/src/lib.rs
@@ -308,7 +308,7 @@ decl_module! {
 
 			// TODO: depends https://github.com/paritytech/substrate/issues/6774
 
-			Self::deposit_event(RawEvent::Delayed(initial_origin, task_id, 0.into()));
+			Self::deposit_event(RawEvent::Delayed(initial_origin, task_id, 0u32.into()));
 		}
 
 		/// Cancel a scheduled dispatchable.