diff --git a/deployment.sh b/deployment.sh
index 553ddad..fdbb2b0 100755
--- a/deployment.sh
+++ b/deployment.sh
@@ -1590,17 +1590,10 @@ EOF
 
 # Debian repositories
 deb ${MIRROR} ${DEBIAN_RELEASE} main contrib non-free
+deb ${SEC_MIRROR} ${DEBIAN_RELEASE}-security main contrib non-free
+deb ${MIRROR} ${DEBIAN_RELEASE}-updates main contrib non-free
 EOF
 
-if [ "$DEBIAN_RELEASE" = "stretch" ] ; then
-  echo  "Warning: not enabling security repository for $DEBIAN_RELEASE"
-  logit "Warning: not enabling security repository for $DEBIAN_RELEASE"
-else
-  echo "deb ${SEC_MIRROR} ${DEBIAN_RELEASE}-security main contrib non-free" >> "$TARGET"/etc/apt/sources.list.d/debian.list
-fi
-
-echo "deb ${MIRROR} ${DEBIAN_RELEASE}-updates main contrib non-free" >> "$TARGET"/etc/apt/sources.list.d/debian.list
-
   # support testing rc releases without providing an according installer package ahead
   if [ -n "$AUTOBUILD_RELEASE" ] ; then
     echo "Running installer with sources.list for $DEBIAN_RELEASE + autobuild release-$AUTOBUILD_RELEASE"