diff --git a/src/entry.sh b/src/entry.sh
index 0095773..17b2147 100644
--- a/src/entry.sh
+++ b/src/entry.sh
@@ -2,6 +2,7 @@
 set -Eeuo pipefail
 
 : "${APP:="Windows"}"
+: "${PLATFORM:="x64"}"
 : "${BOOT_MODE:="windows"}"
 : "${SUPPORT:="https://github.com/dockur/windows"}"