diff --git a/scripts/install b/scripts/install
index 35c4c79..6cae8a0 100755
--- a/scripts/install
+++ b/scripts/install
@@ -16,8 +16,8 @@ source /usr/share/yunohost/helpers
 influxdb_admin_token=$(ynh_string_random --length=64 --filter='A-Za-z0-9-_')
 
 # Check if the retention value is valid
-if ! echo "$influxdb_bucket_retention" | grep -qE '^[0-9]+(ns|u|µ|ms|s|m|h|d|w)$'; then
-    ynh_die --message="Invalid retention value. It should be a number followed by a duration unit (ns, u, µ, ms, s, m, h, d, w)."
+if ! echo "$influxdb_bucket_retention" | grep -qE '^(0|[0-9]+(ns|u|µ|ms|s|m|h|d|w))$'; then
+    ynh_die --message="Invalid retention value. It should be either 0 (infinite) or a number followed by a duration unit (ns, u, µ, ms, s, m, h, d, w)."
 fi
 
 ynh_app_setting_set --app=$app --key=influxdb_org_name --value=$influxdb_org_name