diff --git a/build/mac/NGLayoutBuildList.pm b/build/mac/NGLayoutBuildList.pm
index 0faf4a3becc..628edd7f1a3 100644
--- a/build/mac/NGLayoutBuildList.pm
+++ b/build/mac/NGLayoutBuildList.pm
@@ -203,7 +203,8 @@ sub BuildDist()
 
 	#XPCOM
     InstallFromManifest(":mozilla:xpcom:public:MANIFEST",							"$distdirectory:xpcom:");
-
+	InstallFromManifest(":mozilla:xpcom:src:MANIFEST",								"$distdirectory:xpcom:");
+	
 	#ZLIB
     InstallFromManifest(":mozilla:modules:zlib:src:MANIFEST",						"$distdirectory:zlib:");