diff --git a/engine/server/sv_client.c b/engine/server/sv_client.c
index 64ebfbe4..3f0c4bd0 100644
--- a/engine/server/sv_client.c
+++ b/engine/server/sv_client.c
@@ -843,6 +843,8 @@ void SV_Info( netadr_t from )
 			if( svs.clients[i].state >= cs_connected )
 				count++;
 
+		// a1ba: send protocol version to distinguish old engine and new
+		Info_SetValueForKey( string, "p", va( "%i", PROTOCOL_VERSION ), MAX_INFO_STRING );
 		Info_SetValueForKey( string, "host", hostname.string, MAX_INFO_STRING );
 		Info_SetValueForKey( string, "map", sv.name, MAX_INFO_STRING );
 		Info_SetValueForKey( string, "dm", va( "%i", (int)svgame.globals->deathmatch ), MAX_INFO_STRING );