diff --git a/lib/less/parser.js b/lib/less/parser.js
index 173f0cb8..135aef18 100644
--- a/lib/less/parser.js
+++ b/lib/less/parser.js
@@ -109,7 +109,7 @@ function $(tok, root) {
 
         while (i <= endIndex) {
             c = input.charCodeAt(i);
-            if (! (c === 32 || c === 10)) { break }
+            if (! (c === 32 || c === 10 || c === 9)) { break }
             i++;
         }
         return match.length === 1 ? match[0] : match;