diff --git a/lib/ace/ace.js b/lib/ace/ace.js
index 773f2279..a2261355 100644
--- a/lib/ace/ace.js
+++ b/lib/ace/ace.js
@@ -54,6 +54,7 @@ require("./keyboard/hash_handler");
 require("./placeholder");
 require("./mode/folding/fold_mode");
 require("./theme/textmate");
+require("./ext/error_marker");
 
 exports.config = require("./config");