diff --git a/src/entry.sh b/src/entry.sh
index 7851a44..308cb0e 100644
--- a/src/entry.sh
+++ b/src/entry.sh
@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail
 
+: "${BOOT_MODE:="windows"}"
+
 APP="Windows"
-BOOT_MODE="windows"
 SUPPORT="https://github.com/dockur/windows-arm"
 
 cd /run