diff --git a/scripts/install b/scripts/install
index b98a257..7375167 100644
--- a/scripts/install
+++ b/scripts/install
@@ -65,7 +65,7 @@ fi
 
 # Add the custom error build with the application
 ynh_add_config --template="nginx-code-error.conf" --destination="$nginx_extra_conf_dir/error-code.conf"
-CUSTOM_ERROR_FILE=1
+CUSTOM_ERROR_FILE="true"
 
 # Create a dedicated NGINX config
 ynh_add_nginx_config