diff --git a/Start.bat b/Start.bat
index ddb6e4a..c8c0c64 100644
--- a/Start.bat
+++ b/Start.bat
@@ -24,8 +24,8 @@ if not exist "Logs\" mkdir "Logs"
 set init=0
 set update=0
 
-for %%a in (%*) do if /i "%%~a" equ "/I" set init=1
-for %%a in (%*) do if /i "%%~a" equ "/U" set update=1
+if /i %1 equ "/I" set init=1
+if /i %1 equ "/U" set update=1
 
 @REM powershell -ExecutionPolicy RemoteSigned -File wDayzManager.ps1 -Init %init% -Update %update%
 powershell -ExecutionPolicy RemoteSigned -File wDayzManager.ps1 -Init %init% -Update %update% > Logs\%filename%
diff --git a/wDayzManager.ps1 b/wDayzManager.ps1
index ff3f55a..f7ac27f 100644
--- a/wDayzManager.ps1
+++ b/wDayzManager.ps1
@@ -23,6 +23,12 @@ Param (
 
 [string]$myName = "wDayzManager"
 [string]$myVersion = "v0.7"
+
+if (($init -eq $true) -or ($update -eq $true)) {
+    Write-Error "Only one parameter is accepted - either 'Init' or 'Update'."
+    Exit
+}
+
 [string]$steamScript = $myName + ".txt"
 [string]$iniFile = $myName + ".ini"
 if (-not (Test-Path -Path $iniFile)) {