diff --git a/js/main.js b/js/main.js
index fc72e22..7c731be 100644
--- a/js/main.js
+++ b/js/main.js
@@ -29,7 +29,7 @@ jQuery(document).ready(function($){
 			var word = $(this),
 				letters = word.text().split(''),
 				selected = word.hasClass('is-visible');
-			for (i in letters) {
+			for (let i in letters) {
 				if(word.parents('.rotate-2').length > 0) letters[i] = '<em>' + letters[i] + '</em>';
 				letters[i] = (selected) ? '<i class="in">' + letters[i] + '</i>': '<i>' + letters[i] + '</i>';
 			}
@@ -151,4 +151,4 @@ jQuery(document).ready(function($){
 		$oldWord.removeClass('is-visible').addClass('is-hidden');
 		$newWord.removeClass('is-hidden').addClass('is-visible');
 	}
-});
\ No newline at end of file
+});