diff --git a/core/includes/batch.inc b/core/includes/batch.inc
index 8f91f73..a4b5378 100644
--- a/core/includes/batch.inc
+++ b/core/includes/batch.inc
@@ -164,7 +164,6 @@ function _batch_progress_page() {
     '#percent' => $percentage,
     '#message' => array('#markup' => $message),
     '#label' => $label,
-    '#animate' => TRUE,
     '#attached' => array(
       'html_head' => array(
         array(
diff --git a/core/misc/progress.js b/core/misc/progress.js
index 9e63e11..24c597c 100644
--- a/core/misc/progress.js
+++ b/core/misc/progress.js
@@ -56,7 +56,7 @@
 
     // Implement optional animation of progress bar.
     if (drupalSettings.progressBarAnimate) {
-      $(this.element).find('div.progress__bar').addClass('progress__bar--animate');
+      $(this.element).find('progress__bar').addClass('progress__bar--animate');
     }
   };
 
diff --git a/core/themes/classy/css/components/progress.css b/core/themes/classy/css/components/progress.css
index 7190da1..0a51cf4 100644
--- a/core/themes/classy/css/components/progress.css
+++ b/core/themes/classy/css/components/progress.css
@@ -56,13 +56,13 @@
 .progress__bar--animate {
   -webkit-animation: animate-stripes 3s linear infinite;
   -moz-animation: animate-stripes 3s linear infinite;
+  animation: animate-stripes 3s linear infinite;
   -webkit-transition: width 0.5s ease-out;
   transition: width 0.5s ease-out;
 }
 [dir="rtl"] .progress__bar--animate {
-  animation-direction: reverse;
   -webkit-animation-direction: reverse;
-  -moz-animation-direction: reverse;
+  animation-direction: reverse;
 }
 @-webkit-keyframes animate-stripes {
   0% {background-position: 0 0, 0 0;} 100% {background-position: 0 0, -80px 0;}