diff --git a/src/core/loop/loopFix.js b/src/core/loop/loopFix.js
index 2d30139cf..80d5fa90d 100644
--- a/src/core/loop/loopFix.js
+++ b/src/core/loop/loopFix.js
@@ -49,7 +49,7 @@ export default function loopFix({
 
   if (typeof activeSlideIndex === 'undefined') {
     activeSlideIndex = swiper.getSlideIndex(
-      swiper.slides.filter((el) => el.classList.contains('swiper-slide-active'))[0],
+      swiper.slides.filter((el) => el.classList.contains(params.slideActiveClass))[0],
     );
   } else {
     activeIndex = activeSlideIndex;