diff --git a/Dockerfile b/Dockerfile
index c3c3df7..e2f6aa5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 FROM scratch
-COPY --from=qemux/qemu-docker:4.17 / /
+COPY --from=qemux/qemu-docker:4.18 / /
 
 ARG DEBCONF_NOWARNINGS "yes"
 ARG DEBIAN_FRONTEND "noninteractive"
diff --git a/src/entry.sh b/src/entry.sh
index 83b2457..07866ca 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"
 
 cd /run
diff --git a/src/install.sh b/src/install.sh
index 6208950..e5b21f2 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -854,7 +854,7 @@ prepareImage() {
   local iso="$1"
   local dir="$2"
 
-  if [[ "${BOOT_MODE,,}" == "windows" ]]; then
+  if [[ "${BOOT_MODE,,}" != "windows_legacy" ]]; then
     if [[ "${DETECTED,,}" != "winxp"* ]] && [[ "${DETECTED,,}" != "win2008"* ]]; then
       if [[ "${DETECTED,,}" != "winvista"* ]] && [[ "${DETECTED,,}" != "win7"* ]]; then