diff --git a/Run.sh b/Run.sh
index 78deb35..7f8426a 100755
--- a/Run.sh
+++ b/Run.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 OUTPUT_DIR="$2"
-CFG_FILE="$3"
 DEFAULT_CFG_FILE=NIUT.ini
+CFG_FILE="${3:-$DEFAULT_CFG_FILE}"
 DEFAULT_INSTALL_CFG_FILE=UnrealTournament.ini
 
 function add_iniKeyEx() {