diff --git a/doc/100-General/10-Changelog.md b/doc/100-General/10-Changelog.md
index 1f09448c..e932397a 100644
--- a/doc/100-General/10-Changelog.md
+++ b/doc/100-General/10-Changelog.md
@@ -16,6 +16,7 @@ Released closed milestones can be found on [GitHub](https://github.com/Icinga/ic
 * [#603](https://github.com/Icinga/icinga-powershell-framework/issues/603) Fixes service filter to handle exclude with wildcards instead of requiring the full service name (*not* applying to the display name)
 * [#609](https://github.com/Icinga/icinga-powershell-framework/issues/609) Fixes config generator to never use `set_if = true` on Icinga 2/Icinga Director configuration
 * [#617](https://github.com/Icinga/icinga-powershell-framework/issues/617) Fixes failing calls for plugins which use a switch argument like `-NoPerfData`, which is followed directly by the `-ThresholdInterval` argument
+* [#621](https://github.com/Icinga/icinga-powershell-framework/pull/621) Fixes `-ThresholdInterval` key detection on newer systems
 
 ### Enhancements
 
diff --git a/lib/icinga/plugin/New-IcingaCheck.psm1 b/lib/icinga/plugin/New-IcingaCheck.psm1
index f516d112..43c5815e 100644
--- a/lib/icinga/plugin/New-IcingaCheck.psm1
+++ b/lib/icinga/plugin/New-IcingaCheck.psm1
@@ -66,7 +66,7 @@ function New-IcingaCheck()
                         $this.__TimeInterval = $SetArg;
                         break;
                     }
-                    if ($SetArg -eq '-ThresholdInterval') {
+                    if ($SetArg -eq '-ThresholdInterval' -Or $SetArg -eq '-ThresholdInterval:') {
                         $FoundInterval = $TRUE;
                         continue;
                     }