diff --git a/lib/less/node/ruleset.js b/lib/less/node/ruleset.js
index a46fde0..eab38da 100644
--- a/lib/less/node/ruleset.js
+++ b/lib/less/node/ruleset.js
@@ -9,15 +9,29 @@ node.Ruleset.prototype = {
             if (r instanceof node.Rule && r.variable === true) { return r }
         });
     },
-    toCSS: function (path, env) {
-        var css = [], rules = [], rulesets = [];
+    toCSS: function (context, env) {
+        var css = [],
+            rules = [],
+            rulesets = [],
+            paths = [],
+            selector;
 
-        if (! this.root) path.push(this.selectors.map(function (s) { return s.toCSS(env) }));
+        if (! this.root) {
+            if (context.length === 0) {
+                paths = this.selectors.map(function (s) { return [s.toCSS(env)] });
+            } else {
+                for (var s = 0; s < this.selectors.length; s++) {
+                    for (var c = 0; c < context.length; c++) {
+                        paths.push(context[c].concat([this.selectors[s].toCSS()]));
+                    }
+                }
+            }
+        }
         env.frames.unshift(this);
 
         for (var i = 0; i < this.rules.length; i++) {
             if (this.rules[i] instanceof node.Ruleset) {
-                rulesets.push(this.rules[i].toCSS(path, env));
+                rulesets.push(this.rules[i].toCSS(paths, env));
             } else {
                 if (this.rules[i].toCSS) {
                     rules.push(this.rules[i].toCSS(env));
@@ -26,19 +40,23 @@ node.Ruleset.prototype = {
                 }
             }
         } 
+
+        rulesets = rulesets.join('');
         
-        if (rules.length > 0) {
-            if (path.length > 0) {
-                css.push(path.join('').trim(),
-                         " {\n  " + rules.join('\n  ') + "\n}\n",
-                         rulesets.join(''));
-            } else {
-                css.push(rules.join('\n'), rulesets.join(''));
+        if (this.root) {
+            css.push(rules.join('\n'));
+        } else {
+            if (rules.length > 0) {
+                selector = paths.map(function (p) { return p.join('').trim() })
+                                .join(paths.length > 3 ? ',\n' : ', ').trim();
+                css.push(selector, " {\n  " + rules.join('\n  ') + "\n}\n");
             }
         }
-        path.pop();
+        css.push(rulesets);
         env.frames.shift();
 
+        for (var p = 0; p < paths.length; p++) { paths[p].pop() }
+
         return css.join('');
     }
 };