diff --git a/lib/parse/index.js b/lib/parse/index.js
index 053f0596..b8e008da 100644
--- a/lib/parse/index.js
+++ b/lib/parse/index.js
@@ -79,6 +79,9 @@ module.exports = function(css, options){
 
   function stylesheet() {
     var rulesList = rules();
+    if (css) {
+      error('Parsing ended before all rules could be processed');
+    }
 
     return {
       type: 'stylesheet',