diff --git a/lib/less/tree/selector.js b/lib/less/tree/selector.js
index 5153a8b8..36d77b0f 100644
--- a/lib/less/tree/selector.js
+++ b/lib/less/tree/selector.js
@@ -36,7 +36,7 @@ tree.Selector.prototype = {
             
         oelements = other.elements.map( function(v) {
             return v.combinator.value + (v.value.value || v.value);
-        }).join("").match(/[&#\.\w-]([\w-]|(\\.))*/g); 
+        }).join("").match(/[,&#\.\w-]([\w-]|(\\.))*/g); 
         // ^ regexp could be more simple but see test/less/css-escapes.less:17, doh!
         
         if (!oelements) {