diff --git a/src/languages/nix.js b/src/languages/nix.js
index 494b13b925..7c441dfa6f 100644
--- a/src/languages/nix.js
+++ b/src/languages/nix.js
@@ -198,7 +198,7 @@ export default function(hljs) {
     relevance: 0,
     contains: [
       {
-        className: 'attr',
+        scope: 'attr',
         begin: /\S+/,
         relevance: 0.2
       },