diff --git a/lib/ace/mode/_test/test_highlight_rules.js b/lib/ace/mode/_test/test_highlight_rules.js
index 2c7d9f53..3286c125 100644
--- a/lib/ace/mode/_test/test_highlight_rules.js
+++ b/lib/ace/mode/_test/test_highlight_rules.js
@@ -16,7 +16,7 @@ function generateTestData() {
         return x.replace(/_highlight_rules.js$/, "");
     });
 
-    console.log("Docs:", docs.join());
+    console.log("Docs:", docs);
     console.log("Modes:", modes);
 
     docs.forEach(function(docName) {