diff --git a/frame/support/src/storage/bounded_vec.rs b/frame/support/src/storage/bounded_vec.rs
index e94e907f755de..fbbb9d4d26653 100644
--- a/frame/support/src/storage/bounded_vec.rs
+++ b/frame/support/src/storage/bounded_vec.rs
@@ -999,7 +999,7 @@ pub mod test {
 
 		match c {
 			Err(msg) => assert_eq!(format!("{}", msg), "out of bounds at line 1 column 11"),
-			_ => assert_eq!(c.is_err(), true),
+			_ => unreachable!("deserializer must raise error"),
 		}
 	}
 }