diff --git a/headers/private/media/MediaMisc.h b/headers/private/media/MediaMisc.h
index 4f726289cb..b417ebf9e9 100644
--- a/headers/private/media/MediaMisc.h
+++ b/headers/private/media/MediaMisc.h
@@ -32,6 +32,8 @@
 #define MEDIA_SERVER_PORT_NAME			"__media_server_port"
 #define MEDIA_ADDON_SERVER_PORT_NAME	"__media_addon_server_port"
 
+extern const char *B_MEDIA_ADDON_SERVER_SIGNATURE;
+
 namespace BPrivate { namespace media {
 	extern team_id team;
 } } // BPrivate::media