diff --git a/engine/common/filesystem_engine.c b/engine/common/filesystem_engine.c
index 2ff783d2..dcf0511b 100644
--- a/engine/common/filesystem_engine.c
+++ b/engine/common/filesystem_engine.c
@@ -332,6 +332,7 @@ void FS_Init( const char *basedir )
 	Cvar_RegisterVariable( &fs_mount_lv );
 	Cvar_RegisterVariable( &fs_mount_addon );
 	Cvar_RegisterVariable( &fs_mount_l10n );
+	Cvar_RegisterVariable( &ui_language );
 
 	if( !Sys_GetParmFromCmdLine( "-dll", host.gamedll ))
 		host.gamedll[0] = 0;