diff --git a/index.json b/index.json
index 1e283509..b24d43a0 100644
--- a/index.json
+++ b/index.json
@@ -4936,7 +4936,7 @@
       "status": "Editor's Draft",
       "alternateUrls": [],
       "repository": "https://github.com/tc39/proposal-json-modules",
-      "sourcePath": "spec.html",
+      "sourcePath": "spec.emu",
       "filename": "index.html"
     },
     "title": "JSON modules",