diff --git a/lib/js/index.js b/lib/js/index.js
index 2ede2fb..0785fe2 100644
--- a/lib/js/index.js
+++ b/lib/js/index.js
@@ -4,7 +4,7 @@ const parallaxOffset = 20;
 $(window).on('scroll', () => {
   const movedBy = window.scrollY;
   
-  if ($(window).height() - elem.getBoundingClientRect().top >= parallaxOffset) {
+  if ($(window).height() - parallax.getBoundingClientRect().top >= parallaxOffset) {
     $('.parallax').each((i, parallax) => {
       $(parallax).find('.parallax-layer').each((i, layer) => {
         const depth = $(layer).attr('data-depth-factor') || depthFactor; // dynamically get depthFactor