diff --git a/src/dispatching/dispatchers/filter.rs b/src/dispatching/dispatchers/filter.rs
index 148b2256..5f8d3595 100644
--- a/src/dispatching/dispatchers/filter.rs
+++ b/src/dispatching/dispatchers/filter.rs
@@ -198,7 +198,7 @@ impl<'a, E2, Eh> FilterDispatcher<'a, E2, Eh> {
                     Ok(upd) => upd,
                     Err(err) => {
                         self.error_handler
-                            .handle_error(ErrorKind::FromUpdater(err));
+                            .handle_error(ErrorKind::FromUpdater(err)).await;
                         return;
                     }
                 };
diff --git a/src/dispatching/error_handler.rs b/src/dispatching/error_handler.rs
index ed3703af..56c5a530 100644
--- a/src/dispatching/error_handler.rs
+++ b/src/dispatching/error_handler.rs
@@ -5,6 +5,7 @@ use std::{convert::Infallible, fmt::Debug, future::Future, pin::Pin};
 
 /// An asynchronous handler of an error.
 pub trait ErrorHandler<E> {
+    #[must_use]
     fn handle_error<'a>(
         &'a self,
         error: E,