diff --git a/avif/animated-avif-timeout-ref.html b/avif/animated-avif-timeout-ref.html
index 0eecb3774092e2..52374220c9155e 100644
--- a/avif/animated-avif-timeout-ref.html
+++ b/avif/animated-avif-timeout-ref.html
@@ -1 +1 @@
-<img src=../images/green.avif>
+<img src=../images/green.avif style="height:500px">
diff --git a/avif/animated-avif-timeout.html b/avif/animated-avif-timeout.html
index 13a5722051ed19..0970c994d34c96 100644
--- a/avif/animated-avif-timeout.html
+++ b/avif/animated-avif-timeout.html
@@ -1,7 +1,7 @@
 <html class="reftest-wait">
 <title>Animated AVIF: Second frame displays quickly, replacing red with green.</title>
 <link rel="match" href="animated-avif-timeout-ref.html"/>
-<img src=../images/animated-avif.avif onload="loaded()"/>
+<img src=../images/animated-avif.avif onload="loaded()" style="height:500px"/>
 <script>
   function loaded() {
     setTimeout(function() {
