diff --git a/src/DEBIAN/preinst b/src/DEBIAN/preinst
index c61a2bd..3449ed8 100755
--- a/src/DEBIAN/preinst
+++ b/src/DEBIAN/preinst
@@ -3,7 +3,7 @@
 PACKAGE_NAME="$DPKG_MAINTSCRIPT_PACKAGE"
 
 if [ "${PACKAGE_NAME}" = "cn.flamescion.bookworm-compatibility-mode" ];then
-if [ -e /opt/apps/cn.flamescion.bookworm-compatibility-mode/files/bookworm-env ];then
+if [ -d /opt/apps/cn.flamescion.bookworm-compatibility-mode/files/bookworm-env ];then
 if [ "$(arch)" != "loongarch64" ];then
 mv /opt/apps/cn.flamescion.bookworm-compatibility-mode/files/bookworm-env /opt/apps/cn.flamescion.bookworm-compatibility-mode/files/ace-env
 ln -sfv /opt/apps/cn.flamescion.bookworm-compatibility-mode/files/ace-env /opt/apps/cn.flamescion.bookworm-compatibility-mode/files/bookworm-env