diff --git a/lib/less/parser/parser.js b/lib/less/parser/parser.js
index 7e1ecb5d..0ce0b4d7 100644
--- a/lib/less/parser/parser.js
+++ b/lib/less/parser/parser.js
@@ -1346,7 +1346,7 @@ var Parser = function Parser(env) {
 
                 if (c === '/') {
                     save();
-                    var slashedCombinator = $re(/\/[a-z]+\//i);
+                    var slashedCombinator = $re(/^\/[a-z]+\//i);
                     if (slashedCombinator) {
                         forget();
                         return new(tree.Combinator)(slashedCombinator);
diff --git a/test/css/comments.css b/test/css/comments.css
index f79b7597..a18ab808 100644
--- a/test/css/comments.css
+++ b/test/css/comments.css
@@ -55,6 +55,9 @@
 .test {
   color: 1px;
 }
+.sr-only-focusable {
+  clip: auto;
+}
 #last {
   color: blue;
 }
diff --git a/test/less/comments.less b/test/less/comments.less
index 34b3dbbf..2ecf0da6 100644
--- a/test/less/comments.less
+++ b/test/less/comments.less
@@ -77,6 +77,13 @@
 }
 .mixin_def_with_colors();
 
+// .s when
+//R/2
+
+.sr-only-focusable {
+  clip: auto;
+}
+
 #last { color: blue }
 //