diff --git a/trac/htdocs/libcaca.css b/trac/htdocs/libcaca.css
index 6500c92..01b8509 100644
--- a/trac/htdocs/libcaca.css
+++ b/trac/htdocs/libcaca.css
@@ -664,8 +664,8 @@ table.listing tbody td.new_replies {
     background-color: #C1CFE5;
 }
 .message-list div.topic {
-    -moz-border-radius-top-left: 5px;
-    -moz-border-radius-top-right: 5px;
+    -moz-border-radius-topleft: 5px;
+    -moz-border-radius-topright: 5px;
     -webkit-border-radius-top-left: 5px;
     -webkit-border-radius-top-right: 5px;
     border-radius-top-left: 5px;