diff --git a/lib/core/icingaagent/getters/Get-IcingaAgentMSIPackage.psm1 b/lib/core/icingaagent/getters/Get-IcingaAgentMSIPackage.psm1
index f4b9ed5..5a48b7d 100644
--- a/lib/core/icingaagent/getters/Get-IcingaAgentMSIPackage.psm1
+++ b/lib/core/icingaagent/getters/Get-IcingaAgentMSIPackage.psm1
@@ -62,7 +62,7 @@ function Get-IcingaAgentMSIPackage()
     if ($SkipDownload -eq $FALSE) {
         $DownloadPath = Join-Path $Env:TEMP -ChildPath $UsePackage;
         Write-Host ([string]::Format('Downloading Icinga 2 Agent installer "{0}" into temp directory "{1}"', $UsePackage, $DownloadPath));
-        Invoke-WebRequest -Uri ([string]::Format('{0}/{1}', $Source, $UsePackage)) -OutFile $DownloadPath;
+        Invoke-WebRequest -Uri (Join-WebPath -Path $Source -ChildPath $UsePackage) -OutFile $DownloadPath;
     }
 
     return @{