diff --git a/building.sh b/building.sh
index 5d87a1af..1d3f2869 100755
--- a/building.sh
+++ b/building.sh
@@ -236,7 +236,7 @@ FUNCS=(
   t10
   t20
   t30
-  t31
+  t31  t31_ultimate
 
   xm510
   xm530