diff --git a/lib/stringify/compress.js b/lib/stringify/compress.js
index 929b4a21..7c0b8dfb 100644
--- a/lib/stringify/compress.js
+++ b/lib/stringify/compress.js
@@ -180,8 +180,9 @@ Compiler.prototype['custom-media'] = function(node){
  */
 
 Compiler.prototype.rule = function(node){
+  if (!node.selectors.length) { return ''; }
   var decls = node.declarations;
-  if (!decls.length) return '';
+  if (!decls.length) decls = '';
 
   return this.emit(node.selectors.join(','), node.position)
     + this.emit('{')
diff --git a/lib/stringify/identity.js b/lib/stringify/identity.js
index b390c91e..e10768ed 100644
--- a/lib/stringify/identity.js
+++ b/lib/stringify/identity.js
@@ -216,9 +216,10 @@ Compiler.prototype['custom-media'] = function(node){
  */
 
 Compiler.prototype.rule = function(node){
+  if (!node.selectors.length) { return ''; }
   var indent = this.indent();
   var decls = node.declarations;
-  if (!decls.length) return '';
+  if (!decls.length) decls = '';
 
   return this.emit(node.selectors.map(function(s){ return indent + s }).join(',\n'), node.position)
     + this.emit(' {\n')