diff --git a/src/server/template-renderer/index.js b/src/server/template-renderer/index.js
index f73214f5550..dc5052d9f4b 100644
--- a/src/server/template-renderer/index.js
+++ b/src/server/template-renderer/index.js
@@ -217,7 +217,7 @@ export default class TemplateRenderer {
   }
 
   getUsedAsyncFiles (context: Object): ?Array<string> {
-    if (!context._mappedfiles && context._registeredComponents && this.mapFiles) {
+    if (!context._mappedFiles && context._registeredComponents && this.mapFiles) {
       context._mappedFiles = this.mapFiles(Array.from(context._registeredComponents))
     }
     return context._mappedFiles