diff --git a/scripts/services/scirius/init.sh b/scripts/services/scirius/init.sh
index f02057c..8baf3b6 100755
--- a/scripts/services/scirius/init.sh
+++ b/scripts/services/scirius/init.sh
@@ -35,7 +35,7 @@ if [ "$DISTRO" == "ubuntu" ]; then
     sudo -E apt-get install -y suricata
 elif [ "$DISTRO" == "debian" ]; then
     echo "deb http://http.debian.net/debian $VERSION_CODENAME-backports main" | \
-        sudo -E tee -a /etc/apt/sources.list.d/backports.list
+        sudo -E tee /etc/apt/sources.list.d/backports.list
     sudo -E apt-get update
     sudo -E apt-get install -y suricata -t ${VERSION_CODENAME}-backports
 else