diff --git a/src/bytes.rs b/src/bytes.rs
index 96af7d6af..66b941d99 100644
--- a/src/bytes.rs
+++ b/src/bytes.rs
@@ -237,7 +237,7 @@ impl Bytes {
         };
 
         let end = match range.end_bound() {
-            Bound::Included(&n) => n + 1,
+            Bound::Included(&n) => n.checked_add(1).expect("out of range"),
             Bound::Excluded(&n) => n,
             Bound::Unbounded => len,
         };