diff --git a/toolkit/content/tests/chrome/test_mousecapture.xul b/toolkit/content/tests/chrome/test_mousecapture.xul
index 351c38475b43..14baca85a57e 100644
--- a/toolkit/content/tests/chrome/test_mousecapture.xul
+++ b/toolkit/content/tests/chrome/test_mousecapture.xul
@@ -11,7 +11,7 @@
 <script>
 <![CDATA[
 
-SimpleTest.expectAssertions(12);
+SimpleTest.expectAssertions(6, 12);
 
 SimpleTest.waitForExplicitFinish();