diff --git a/src/cascading_merkle_tree.rs b/src/cascading_merkle_tree.rs
index 51e82aa..2d14974 100644
--- a/src/cascading_merkle_tree.rs
+++ b/src/cascading_merkle_tree.rs
@@ -362,7 +362,7 @@ where
         // If the index is out of bounds, we need to resize the storage
         // we must always have 2^n leaves for any n
         if new_last_leaf_index >= storage_len {
-            let next_power_of_two = (new_last_leaf_index + 1).next_power_of_two();
+            let next_power_of_two = new_last_leaf_index.next_power_of_two();
             let diff = next_power_of_two - storage_len;
 
             self.storage