diff --git a/lib/core/icingaagent/installer/Install-IcingaAgent.psm1 b/lib/core/icingaagent/installer/Install-IcingaAgent.psm1
index b869a1a..44eac5f 100644
--- a/lib/core/icingaagent/installer/Install-IcingaAgent.psm1
+++ b/lib/core/icingaagent/installer/Install-IcingaAgent.psm1
@@ -2,9 +2,9 @@ function Install-IcingaAgent()
 {
     param(
         [string]$Version,
-        [string]$Source       = 'https://packages.icinga.com/windows/',
-        [string]$InstallDir   = '',
-        [switch]$AllowUpdates
+        [string]$Source     = 'https://packages.icinga.com/windows/',
+        [string]$InstallDir = '',
+        [bool]$AllowUpdates = $FALSE
     );
 
     $IcingaData       = Get-IcingaAgentInstallation;