diff --git a/doc/100-General/10-Changelog.md b/doc/100-General/10-Changelog.md
index 64c93dc..d33bfa9 100644
--- a/doc/100-General/10-Changelog.md
+++ b/doc/100-General/10-Changelog.md
@@ -19,6 +19,7 @@ Released closed milestones can be found on [GitHub](https://github.com/Icinga/ic
 * [#381](https://github.com/Icinga/icinga-powershell-framework/issues/381) Fixes Repository Hash generator for new repositories, which always returned the same hash regardless of the files inside
 * [#386](https://github.com/Icinga/icinga-powershell-framework/pull/386) Fixes check command config generator for Icinga Director baskets/Icinga 2 conf files, in case we are using a check command with an alias as reference to a new name of a check command
 * [#387](https://github.com/Icinga/icinga-powershell-framework/pull/387) Fixes config generator to use alias names for command arguments/parameters in case available instead of the real name
+* [#390](https://github.com/Icinga/icinga-powershell-framework/pull/390) Fixes threshold interval time conversion by using `-ThresholdInterval` with values that cause the used `TimeSpan` object to move from minutes to hours, like `60m` and `1h`
 
 ### Enhancements
 
diff --git a/lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1 b/lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1
index 8659e73..c7de343 100644
--- a/lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1
+++ b/lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1
@@ -61,7 +61,7 @@ function Compare-IcingaPluginThresholds()
 
     if ([string]::IsNullOrEmpty($TimeInterval) -eq $FALSE -And $null -ne $ThresholdCache) {
         $TimeSeconds        = ConvertTo-Seconds $TimeInterval;
-        $MinuteInterval     = ([TimeSpan]::FromSeconds($TimeSeconds)).Minutes;
+        $MinuteInterval     = [math]::round(([TimeSpan]::FromSeconds($TimeSeconds)).TotalMinutes, 0);
         $CheckPerfDataLabel = [string]::Format('{0}_{1}', (Format-IcingaPerfDataLabel $CheckName), $MinuteInterval);
 
         if ($null -ne $ThresholdCache.$CheckPerfDataLabel) {
@@ -96,7 +96,7 @@ function Compare-IcingaPluginThresholds()
                 $Threshold      = $TmpValue.Substring(0, $LastIndex);
                 $TimeIndex      = $TmpValue.Substring($LastIndex + 1, $TmpValue.Length - $LastIndex - 1);
                 $TimeSeconds    = ConvertTo-Seconds $TimeIndex;
-                $MinuteInterval = ([TimeSpan]::FromSeconds($TimeSeconds)).Minutes;
+                $MinuteInterval = [math]::round(([TimeSpan]::FromSeconds($TimeSeconds)).TotalMinutes, 0);
 
                 $CheckPerfDataLabel = [string]::Format('{0}_{1}', (Format-IcingaPerfDataLabel $CheckName), $MinuteInterval);