diff --git a/tools/twn b/tools/twn
index cb70d7f..b70817e 100755
--- a/tools/twn
+++ b/tools/twn
@@ -8,7 +8,7 @@ export TWNROOT=$(realpath "$toolpath"/../)
 export TWNBUILDDIR=$(realpath "$toolpath"/../.build)
 
 case "$1" in
-    build ) "$toolpath"/build.sh
+    build ) "$toolpath"/build.sh "${@:2}"
             ;;
     *     ) echo "Unknown command."
             ;;