diff --git a/mailnews/base/public/MANIFEST b/mailnews/base/public/MANIFEST
index ee3d2749bb1..76bf4bb4801 100644
--- a/mailnews/base/public/MANIFEST
+++ b/mailnews/base/public/MANIFEST
@@ -17,6 +17,7 @@
 #
 
 msgCore.h
+nsIMsgHdr.h
 nsMsgFolderFlags.h
 nsMsgHeaderMasks.h
 nsMsgLocalFolderHdrs.h