diff --git a/phpBB/config/environment_debug.yml b/phpBB/config/environment_development.yml
similarity index 100%
rename from phpBB/config/environment_debug.yml
rename to phpBB/config/environment_development.yml
diff --git a/phpBB/includes/functions_install.php b/phpBB/includes/functions_install.php
index 2be8e6e860..1b63414cec 100644
--- a/phpBB/includes/functions_install.php
+++ b/phpBB/includes/functions_install.php
@@ -453,7 +453,7 @@ function phpbb_create_config_file_data($data, $dbms, $debug = false, $debug_cont
 
 	if ($debug)
 	{
-		$config_data .= "@define('ENVIRONMENT', 'debug');\n";
+		$config_data .= "@define('ENVIRONMENT', 'development');\n";
 	}
 	else
 	{