diff --git a/scripts/install b/scripts/install
index f9d10f6..ddbe8f0 100644
--- a/scripts/install
+++ b/scripts/install
@@ -15,10 +15,10 @@ source /usr/share/yunohost/helpers
 ynh_script_progression --message="Storing installation settings..." --weight=2
 
 # DNS over TLS
-adguard_dot_port=853
+adguard_dot_port=ynh_find_port --port=853
 ynh_app_setting_set --app="$app" --key=adguard_dot_port --value=$adguard_dot_port
 # DNS over QUIC
-adguard_doq_port=784
+adguard_doq_port=ynh_find_port --port=784
 ynh_app_setting_set --app="$app" --key=adguard_doq_port --value=$adguard_doq_port
 
 if [ "$dns_over_https" == "1" ];
diff --git a/scripts/upgrade b/scripts/upgrade
index fbac0c3..9b61ecc 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -32,10 +32,10 @@ ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 if [ -z "$adguard_dot_port" ] || [ -z "$adguard_doq_port" ];
 then
 	# DNS over TLS
-	adguard_dot_port=853
+	adguard_dot_port=ynh_find_port --port=853
 	ynh_app_setting_set --app=$app --key=adguard_dot_port --value=$adguard_dot_port
 	# DNS over QUIC
-	adguard_doq_port=784
+	adguard_doq_port=ynh_find_port --port=784
 	ynh_app_setting_set --app="$app" --key=adguard_doq_port --value=$adguard_doq_port
 fi