diff --git a/lib/MerkleTree.js b/lib/MerkleTree.js
index 6c7cbac..b9b134c 100644
--- a/lib/MerkleTree.js
+++ b/lib/MerkleTree.js
@@ -26,9 +26,9 @@ class MerkleTree {
         this.storage.put(MerkleTree.index_to_key(prefix, level, i), element)
       })
       level++
-      let numberOfElementInRow = Math.ceil(defaultElements.length / 2)
+      let numberOfElementsInLevel = Math.ceil(defaultElements.length / 2)
       for (level; level <= this.n_levels; level++) {
-        for(let i = 0; i < numberOfElementInRow; i++) {
+        for(let i = 0; i < numberOfElementsInLevel; i++) {
           const leftKey = MerkleTree.index_to_key(prefix, level - 1, 2 * i)
           const rightKey = MerkleTree.index_to_key(prefix, level - 1, 2 * i + 1)
 
@@ -38,7 +38,7 @@ class MerkleTree {
           const subRoot = this.hasher.hash(null, left, right)
           this.storage.put(MerkleTree.index_to_key(prefix, level, i), subRoot)
         }
-        numberOfElementInRow = Math.max(Math.ceil(numberOfElementInRow / 2), 1)
+        numberOfElementsInLevel = Math.ceil(numberOfElementsInLevel / 2)
       }
     }
   }