diff --git a/dom/animation/test/chrome/test_animation_performance_warning.html b/dom/animation/test/chrome/test_animation_performance_warning.html
index be7ab9c946f2..5acda77925d7 100644
--- a/dom/animation/test/chrome/test_animation_performance_warning.html
+++ b/dom/animation/test/chrome/test_animation_performance_warning.html
@@ -1177,7 +1177,7 @@ function start() {
       assert_animation_property_state_equals(
         animation.effect.getProperties(),
         [ { property: 'transform', runningOnCompositor: true } ]);
-      animation.effect.target.style = 'width: 5200px; height: 5200px';
+      animation.effect.target.style = 'width: 10000px; height: 10000px';
       return waitForFrame();
     }).then(() => {
       // viewport depends on test environment.
@@ -1212,13 +1212,13 @@ function start() {
       assert_animation_property_state_equals(
         animation.effect.getProperties(),
         [ { property: 'transform', runningOnCompositor: true } ]);
-      animation.effect.target.style = 'width: 5200px; height: 1px';
+      animation.effect.target.style = 'width: 20000px; height: 1px';
       return waitForFrame();
     }).then(() => {
       // viewport depends on test environment.
       var expectedWarning = new RegExp(
         "Animation cannot be run on the compositor because the frame size " +
-        "\\(5200, 1\\) is too large relative to the viewport " +
+        "\\(20000, 1\\) is too large relative to the viewport " +
         "\\(larger than \\(\\d+, \\d+\\)\\) or larger than the " +
         "maximum allowed value \\(\\d+, \\d+\\)");
       assert_animation_property_state_equals(