--- a/layout/forms/test/test_bug549170.html
+++ b/layout/forms/test/test_bug549170.html
@@ -42,23 +42,23 @@ function mouseHandler(aEvent)
   is(SpecialPowers.wrap(aEvent).originalTarget.nodeName, "DIV", "An inner div should be the target of the event");
   ok(SpecialPowers.wrap(aEvent).originalTarget.classList.contains("anonymous-div"), "the target div should be the editor div");
 }
 
 function checkMouseEvents(element)
 {
   gNumberOfMouseEventsCatched = 0;
 
-  synthesizeMouse(element, 5, 5, {type: "mousedown", button: 0});
-  synthesizeMouse(element, 5, 5, {type: "mouseup",   button: 0});
-  synthesizeMouse(element, 5, 5, {type: "mousedown", button: 1});
+  synthesizeMouse(element, 7, 7, {type: "mousedown", button: 0});
+  synthesizeMouse(element, 7, 7, {type: "mouseup",   button: 0});
+  synthesizeMouse(element, 7, 7, {type: "mousedown", button: 1});
   // NOTE: this event is going to copy the buffer on linux, this should not be a problem
-  synthesizeMouse(element, 5, 5, {type: "mouseup",   button: 1});
-  synthesizeMouse(element, 5, 5, {type: "mousedown", button: 2});
-  synthesizeMouse(element, 5, 5, {type: "mouseup",   button: 2});
+  synthesizeMouse(element, 7, 7, {type: "mouseup",   button: 1});
+  synthesizeMouse(element, 7, 7, {type: "mousedown", button: 2});
+  synthesizeMouse(element, 7, 7, {type: "mouseup",   button: 2});
 
   is(gNumberOfMouseEventsCatched, 6, "Some mouse events have not been catched");
 }
 
 function runTests()
 {
   checkMouseEvents(document.getElementById('i'));
   checkMouseEvents(document.getElementById('t'));