diff --git a/src/array/wiggle-sort.js b/src/array/wiggle-sort.js
index 039304e..dd67af1 100644
--- a/src/array/wiggle-sort.js
+++ b/src/array/wiggle-sort.js
@@ -12,7 +12,7 @@
  */
 const wiggleSort = nums => {
   for (let i = 1; i < nums.length; i++) {
-    if ((i % 2 === 0) === nums[i] > nums[i - 1]) {
+    if ((i % 2 === 0) && nums[i] > nums[i - 1]) {
       [nums[i], nums[i - 1]] = [nums[i - 1], nums[i]];
     }
   }