diff --git a/scripts/_common.sh b/scripts/_common.sh
index ed1a2b8..59992d6 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -120,6 +120,15 @@ ynh_debian_release () {
 	lsb_release --codename --short
 }
 
+is_buster () {
+	if [ "$(ynh_debian_release)" == "buster" ]
+	then
+		return 0
+	else
+		return 1
+	fi
+}
+
 is_stretch () {
 	if [ "$(ynh_debian_release)" == "stretch" ]
 	then
diff --git a/scripts/upgrade b/scripts/upgrade
index 3401b3b..139e4ee 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -57,10 +57,14 @@ if grep "borg.timer" /etc/yunohost/services.yml > /dev/null ; then
 fi
 
 # Replace backports with pip
-if is_stretch; then
+if is_buster; then
+    if [ ! -f /opt/borg-env/buster ] ; then
     rm -f /etc/apt/sources.list.d/$app-stretch-backports.list
-
+    ynh_secure_remove /opt/borg-env
     install_borg_with_pip
+    touch /opt/borg-env/buster
+    fi
+    
 fi
 
 #=================================================