diff --git a/mailnews/mime/public/MANIFEST_IDL b/mailnews/mime/public/MANIFEST_IDL
new file mode 100644
index 000000000000..5c2de3af4486
--- /dev/null
+++ b/mailnews/mime/public/MANIFEST_IDL
@@ -0,0 +1 @@
+nsIMimeStreamConverter.idl