diff --git a/files/debian/debian-sources-update.sh b/files/debian/debian-sources-update.sh
index 71ea0f3..0fdfe2a 100644
--- a/files/debian/debian-sources-update.sh
+++ b/files/debian/debian-sources-update.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 isInFile=$(cat /etc/apt/sources.list | grep -c "bookworm")
-if [ $isInFile -ne 1 ]; then
+if [ $isInFile -ne 0 ]; then
         mkdir /etc/apt/mirrors > /dev/null 2>&1
         echo "https://deb.debian.org/debian" >> /etc/apt/mirrors/debian.list
         echo "https://deb.debian.org/debian-security" >> /etc/apt/mirrors/debian-security.list