diff --git a/doc/31-Changelog.md b/doc/31-Changelog.md
index 55968dc..035f8de 100644
--- a/doc/31-Changelog.md
+++ b/doc/31-Changelog.md
@@ -26,6 +26,7 @@ Released closed milestones can be found on [GitHub](https://github.com/Icinga/ic
 * [#79](https://github.com/Icinga/icinga-powershell-framework/issues/79) Fix ConvertTo-Seconds to output valid numeric data with multiple digits
 * [#81](https://github.com/Icinga/icinga-powershell-framework/issues/81), [#82](https://github.com/Icinga/icinga-powershell-framework/issues/82) Fix error on EventLog initialising in case `Icinga for Windows` application is not registered on new machines
 * [#84](https://github.com/Icinga/icinga-powershell-framework/issues/84), Fix conversion of `ConvertTo-Seconds` and `ConvertTo-SecondsFromIcingaThresholds` while the input value is `$null`
+* [#85](https://github.com/Icinga/icinga-powershell-framework/issues/85), Fix incorrect handling to empty service user password which was configured as empty `String` instead of `$null` `SecureString` object
 
 ## 1.1.2 (2020-07-01)
 
diff --git a/lib/core/icingaagent/misc/Start-IcingaAgentInstallWizard.psm1 b/lib/core/icingaagent/misc/Start-IcingaAgentInstallWizard.psm1
index c01d7e2..77aa5b7 100644
--- a/lib/core/icingaagent/misc/Start-IcingaAgentInstallWizard.psm1
+++ b/lib/core/icingaagent/misc/Start-IcingaAgentInstallWizard.psm1
@@ -472,8 +472,8 @@ function Start-IcingaAgentInstallWizard()
                     $ServicePass = (Get-IcingaAgentInstallerAnswerInput -Prompt 'Please enter the password for your service user' -Secure -Default 'v').answer;
                     $InstallerArguments += "-ServicePass $ServicePass";
                 } else {
-                    $ServicePass = '';
-                    $InstallerArguments += "-ServicePass ''";
+                    $ServicePass         = $null
+                    $InstallerArguments += '-ServicePass $null';
                 }
             }
         } else {