diff --git a/src/languages/nix.js b/src/languages/nix.js
index 674d7e3eca..3bbb84ec43 100644
--- a/src/languages/nix.js
+++ b/src/languages/nix.js
@@ -219,7 +219,7 @@ export default function(hljs) {
     relevance: 0,
     contains: [
       {
-        className: 'attr',
+        scope: 'attr',
         begin: /\S+/,
         relevance: 0.2
       },