diff --git a/matter-iso/main.sh b/matter-iso/main.sh
index 7aa654a..b591ba5 100755
--- a/matter-iso/main.sh
+++ b/matter-iso/main.sh
@@ -65,7 +65,7 @@ check_iso_vars() {
     return 1
   elif [ ! -n "$VERSION" ]; then
     return 1
-  elif ! type build &>/dev/null; then
+  elif ! type BUILD &>/dev/null; then
     return 1
   fi
 
@@ -191,7 +191,7 @@ if [ ! -z "${PKGS1}" ]; then
 fi
 
 info "Running build script"
-echo "source /iso.sh && build" > "${tmpdir}/stager.sh"
+echo "source /iso.sh && BUILD" > "${tmpdir}/stager.sh"
 matter-chroot "${tmpdir}" chmod +x /stager.sh
 matter-chroot "${tmpdir}" /stager.sh
 check_ret "Build script failed"