diff --git a/public/app/system.conf.js b/public/app/system.conf.js
index d3e45c8f613..7238bd65ec2 100644
--- a/public/app/system.conf.js
+++ b/public/app/system.conf.js
@@ -34,6 +34,9 @@ System.config({
     vendor: {
       defaultExtension: 'js',
     },
+    plugins: {
+      defaultExtension: 'js',
+    },
     test: {
       defaultExtension: 'js',
     },