diff --git a/bridges/relays/ethereum/src/sync_loop.rs b/bridges/relays/ethereum/src/sync_loop.rs
index e1437ccdc57e..73ccc49b9803 100644
--- a/bridges/relays/ethereum/src/sync_loop.rs
+++ b/bridges/relays/ethereum/src/sync_loop.rs
@@ -659,7 +659,7 @@ mod tests {
 			|_| {},
 			&mut go_offline_future,
 			|delay| async_std::task::sleep(delay),
-			|| unreachable!(),
+			|| "Test error".into(),
 		);
 
 		(interval2, backoff.next_backoff().unwrap())