diff --git a/lib/mergeDeep.js b/lib/mergeDeep.js
index a799877e..d6c82774 100644
--- a/lib/mergeDeep.js
+++ b/lib/mergeDeep.js
@@ -77,9 +77,9 @@ class MergeDeep {
 
         // Deep compare Array if the same element is there in source and target,
         if (Array.isArray(source[key]) && Array.isArray(target[key])) {
-          // if (source[key].length !== target[key].length) {
-          //   modifications[key] = source[key]
-          // }
+          if (source[key].length !== target[key].length) {
+            modifications[key] = source[key]
+          }
           const visited = {}
           const temp = [...source[key], ...target[key]]
           for (const a of temp) {
@@ -247,4 +247,4 @@ class MergeDeep {
     return modifications
   }
 }
-module.exports = MergeDeep
\ No newline at end of file
+module.exports = MergeDeep