diff --git a/scripts/install b/scripts/install
index 18f64a2..b2ce07b 100644
--- a/scripts/install
+++ b/scripts/install
@@ -26,6 +26,7 @@ synapse_db_name="matrix_$app"
 synapse_db_user="matrix_$app"
 upstream_version=$(ynh_app_upstream_version)
 report_stats="False"
+default_domain_value="Same than the domain"
 
 #=================================================
 # RETRIEVE ARGUMENTS FROM THE MANIFEST
@@ -33,7 +34,7 @@ report_stats="False"
 
 domain=$YNH_APP_ARG_DOMAIN
 server_name=$YNH_APP_ARG_SERVER_NAME
-if [ $server_name == "Same than the domain" ]; then
+if [[ "$server_name" == "$default_domain_value" ]]; then
     server_name=$domain    
 fi
 is_public=$YNH_APP_ARG_IS_PUBLIC