diff --git a/layout/style/crashtests/972199-1.html b/layout/style/crashtests/972199-1.html
index ecd57ca2a7a9..a4e0de0d81ca 100644
--- a/layout/style/crashtests/972199-1.html
+++ b/layout/style/crashtests/972199-1.html
@@ -17,8 +17,6 @@
 <div></div>
 <script type="application/javascript">
 
-SpecialPowers.setBoolPref("layers.offmainthreadcomposition.async-animations",
-                          true);
 window.addEventListener("load", function() {
   document.querySelector("div").setAttribute("style",
     "animation: 100s 300s anim linear");
diff --git a/layout/style/crashtests/crashtests.list b/layout/style/crashtests/crashtests.list
index f2ae7dedbcdb..41e47668e1ad 100644
--- a/layout/style/crashtests/crashtests.list
+++ b/layout/style/crashtests/crashtests.list
@@ -102,7 +102,7 @@ load 927734-1.html
 load 930270-1.html
 load 930270-2.html
 load 945048-1.html
-load 972199-1.html
+pref(layers.offmainthreadcomposition.async-animations,true) load 972199-1.html
 load 989965-1.html
 load 992333-1.html
 pref(dom.webcomponents.enabled,true) load 1017798-1.html