--- a/testing/web-platform/tests/css/cssom-view/overscrollBehavior-manual.html
+++ b/testing/web-platform/tests/css/cssom-view/overscrollBehavior-manual.html
@@ -47,16 +47,17 @@
   <li id="i1">Make two scrolls on <span style="color: blue">BLUE</span>, in this order: scroll UP (or drag down), then scroll LEFT (or drag right). Scroll (or drag) until nothing is scrolling. Then tap on DONE.</li>
   <li id="i2">Repeat the same scrolls as in step 1 and then tap on DONE.</li>
   <li id="i3">Repeat the same scrolls as in step 1 and then tap on DONE.</li>
   <li id="i4">Make two separate scrolls on <span style="color: green">GREEN</span>, in this order: scroll UP (or drag down), then scroll LEFT (or drag right). Scroll (or drag) until nothing is scrolling. Then tap on DONE.</li>
 </ol>
 
 
 <script>
+setup({explicit_timeout: true});
 const container = document.getElementById('container');
 const non_scrollable = document.getElementById('non_scrollable');
 const root = document.getElementById('root');
 var test = async_test("overscroll-behavior prevents scroll-propagation in the area and direction as specified");
 var instruction1 = document.getElementById("i1");
 var instruction2 = document.getElementById("i2");
 var instruction3 = document.getElementById("i3");
 var instruction4 = document.getElementById("i4");