diff --git a/runtime/src/accounts_db.rs b/runtime/src/accounts_db.rs
index cfdb9d7192..e66b1e9ef3 100644
--- a/runtime/src/accounts_db.rs
+++ b/runtime/src/accounts_db.rs
@@ -6895,7 +6895,7 @@ impl AccountsDb {
         let first_boundary =
             ((slot0 + MAX_ITEMS_PER_CHUNK) / MAX_ITEMS_PER_CHUNK) * MAX_ITEMS_PER_CHUNK;
 
-        let width = max_slot_inclusive - slot0;
+        let width = max_slot_inclusive - slot0 + 1;
         // 2 is for 2 special chunks - unaligned slots at the beginning and end
         let chunks = ancient_slot_count + 2 + (width as Slot / MAX_ITEMS_PER_CHUNK);
         (0..chunks)