diff --git a/script-install-motd b/script-install-motd
index 762c4ac9..e5a52586 100755
--- a/script-install-motd
+++ b/script-install-motd
@@ -338,7 +338,7 @@ generate-services() {
 
 chmod +x "$script"
 
-if [[ -v DEBUG ]]; then
+if (( DEBUG )); then
   bash generate-motd.sh
   cat -n generate-motd.sh
   rm generate-motd.sh