diff --git a/headers/os/app/Message.h b/headers/os/app/Message.h
index 685edf1b39..c5da3b9217 100644
--- a/headers/os/app/Message.h
+++ b/headers/os/app/Message.h
@@ -447,7 +447,7 @@ static	BBlockCache	*sMsgCache;
 
 		BMessage::entry_hdr	*fEntries;
 
-		struct {
+		struct reply_to_info {
 			port_id				port;
 			int32				target;
 			team_id				team;