diff --git a/less/navs.less b/less/navs.less
index cd356d9bb8..f1d5b565c4 100644
--- a/less/navs.less
+++ b/less/navs.less
@@ -317,6 +317,7 @@
 .tabs-left .tabs .active > a,
 .tabs-left .tabs .active > a:hover {
   border-color: #ddd transparent #ddd #ddd;
+  *border-right-color: @white;
 }
 
 // Tabs on the right
@@ -335,4 +336,5 @@
 .tabs-right .tabs .active > a,
 .tabs-right .tabs .active > a:hover {
   border-color: #ddd #ddd #ddd transparent;
+  *border-left-color: @white;
 }