diff --git a/Makefile b/Makefile
index 219882d0..33554fb4 100644
--- a/Makefile
+++ b/Makefile
@@ -41,6 +41,7 @@ less:
 	      ${SRC}/env.js\
 	      ${SRC}/visitor.js\
 	      ${SRC}/import-visitor.js\
+	      ${SRC}/join-selector-visitor.js\
 	      ${SRC}/browser.js\
 	      build/amd.js >> ${DIST}
 	@@echo "})(window);" >> ${DIST}
@@ -64,6 +65,7 @@ rhino:
 	      ${SRC}/env.js\
 	      ${SRC}/visitor.js\
 	      ${SRC}/import-visitor.js\
+	      ${SRC}/join-selector-visitor.js\
 	      ${SRC}/functions.js\
 	      ${SRC}/colors.js\
 	      ${SRC}/tree/*.js\
diff --git a/lib/less/index.js b/lib/less/index.js
index 2f9e154c..e483df8a 100644
--- a/lib/less/index.js
+++ b/lib/less/index.js
@@ -217,5 +217,6 @@ require('./functions');
 require('./colors');
 require('./visitor.js');
 require('./import-visitor.js');
+require('./join-selector-visitor.js');
 
 for (var k in less) { exports[k] = less[k]; }
diff --git a/lib/less/join-selector-visitor.js b/lib/less/join-selector-visitor.js
new file mode 100644
index 00000000..cf0c6685
--- /dev/null
+++ b/lib/less/join-selector-visitor.js
@@ -0,0 +1,34 @@
+(function (tree) {
+    tree.joinSelectorVisitor = function() {
+        this.context = [];
+        this._visitor = new tree.visitor(this);
+    };
+
+    tree.joinSelectorVisitor.prototype = {
+        run: function (root) {
+            return this._visitor.visit(root);
+        },
+        visitRule: function (ruleNode, visitArgs) {
+            visitArgs.visitDeeper = false;
+            return ruleNode;
+        },
+        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
+            visitArgs.visitDeeper = false;
+            return mixinDefinitionNode;
+        },
+
+        visitRuleset: function (rulesetNode, visitArgs) {
+
+            return rulesetNode;
+        },
+        visitMedia: function (rulesetNode, visitArgs) {
+
+            return rulesetNode;
+        },
+        visitDirective: function (rulesetNode, visitArgs) {
+
+            return rulesetNode;
+        }
+    };
+
+})(require('./tree'));
\ No newline at end of file
diff --git a/lib/less/parser.js b/lib/less/parser.js
index f88e5c3d..13f3cbb1 100644
--- a/lib/less/parser.js
+++ b/lib/less/parser.js
@@ -404,8 +404,12 @@ less.Parser = function Parser(env) {
                     }
 
                     try {
-                        var css = evaluate.call(this, evalEnv)
-                                          .toCSS([], {
+                        var evaldRoot = evaluate.call(this, evalEnv);
+
+                        new(tree.joinSelectorVisitor)()
+                            .run(evaldRoot);
+
+                        var css = evaldRoot.toCSS([], {
                                 compress: options.compress || false,
                                 dumpLineNumbers: env.dumpLineNumbers,
                                 strictUnits: options.strictUnits === false ? false : true});