diff --git a/mkosi.postinst.chroot b/mkosi.postinst.chroot
index dd48b02..2094fcb 100755
--- a/mkosi.postinst.chroot
+++ b/mkosi.postinst.chroot
@@ -127,7 +127,7 @@ KEEP_THEME="breeze-bgrt"
 plymouth-set-default-theme "$KEEP_THEME"
 
 # Remove all other themes except KEEP_THEME, text, and details
-for theme in $(plymouth-set-default-theme -l); do
+for theme in $(plymouth-set-default-theme --list); do
     if [[ "$theme" != "$KEEP_THEME" && "$theme" != "text" && "$theme" != "details" ]]; then
         theme_dir="/usr/share/plymouth/themes/$theme"
         [[ -d "$theme_dir" ]] && rm -rf -- "$theme_dir"