diff --git a/layout/reftests/bugs/633344-1-ref.html b/layout/reftests/bugs/633344-1-ref.html
index 39b43baee1db..91960fc34a65 100644
--- a/layout/reftests/bugs/633344-1-ref.html
+++ b/layout/reftests/bugs/633344-1-ref.html
@@ -28,7 +28,7 @@ canvas {
 <script>
 var ctx = document.getElementById("c").getContext("2d");
 ctx.fillStyle = "black";
-ctx.fillRect(2, 2, 6, 6);
+ctx.fillRect(0, 0, 10, 10);
 </script>
 </body>
 </html>
diff --git a/layout/reftests/bugs/633344-1.html b/layout/reftests/bugs/633344-1.html
index b91fda3f2a5e..ff87d1e93572 100644
--- a/layout/reftests/bugs/633344-1.html
+++ b/layout/reftests/bugs/633344-1.html
@@ -31,7 +31,7 @@ canvas {
 <script>
 var ctx = document.getElementById("c").getContext("2d");
 ctx.fillStyle = "black";
-ctx.fillRect(2, 2, 6, 6);
+ctx.fillRect(0, 0, 10, 10);
 </script>
 </body>
 </html>