diff --git a/extensions/json/package.json b/extensions/json/package.json
index 517346cd347..0ee9501609f 100644
--- a/extensions/json/package.json
+++ b/extensions/json/package.json
@@ -29,6 +29,7 @@
           ".css.map"
         ],
         "filenames": [
+          "composer.lock",
           ".watchmanconfig",
           ".ember-cli"
         ],