diff --git a/server/document.js b/server/document.js
index 315a8cca..06df652e 100644
--- a/server/document.js
+++ b/server/document.js
@@ -195,7 +195,7 @@ export class NextScript extends Component {
           }
 
           ${page === '_error' && `
-          __NEXT_REGISTER_PAGE('${pathname}', function() {
+          __NEXT_REGISTER_PAGE('${htmlescape(pathname)}', function() {
             var error = new Error('Page does not exist: ${htmlescape(pathname)}')
             error.statusCode = 404