diff --git a/lib/less/parser.js b/lib/less/parser.js
index 5074c1bc..2e5547f3 100644
--- a/lib/less/parser.js
+++ b/lib/less/parser.js
@@ -1170,7 +1170,7 @@ less.Parser = function Parser(env) {
 
                 if (value = $(this['import']) || $(this.media)) {
                     return value;
-                } else if (name = $(/^@page|@keyframes/) || $(/^@(?:-webkit-|-moz-|-o-|-ms-)[a-z0-9-]+/)) {
+                } else if (name = $(/^@page|@keyframes/) || $(/^@(?:-webkit-|-khtml-|-moz-|-o-|-ms-)[a-z0-9-]+/)) {
                     types = ($(/^[^{]+/) || '').trim();
                     if (rules = $(this.block)) {
                         return new(tree.Directive)(name + " " + types, rules);