diff --git a/lib/core/tools/Convert-IcingaPluginValueToString.psm1 b/lib/core/tools/Convert-IcingaPluginValueToString.psm1
index c8c9928..ccc6850 100644
--- a/lib/core/tools/Convert-IcingaPluginValueToString.psm1
+++ b/lib/core/tools/Convert-IcingaPluginValueToString.psm1
@@ -19,24 +19,24 @@ function Convert-IcingaPluginValueToString()
     }
 
     if ($Unit -eq '%' -Or [string]::IsNullOrEmpty($Unit)) {
-        return ([string]::Format('{0}{1}', $AdjustedValue, $Unit));
+        return ([string]::Format('{0}{1}', ([string]$AdjustedValue).Replace(',', '.'), $Unit));
     }
 
     switch ($OriginalUnit) {
         { ($_ -eq "Kbit") -or ($_ -eq "Mbit") -or ($_ -eq "Gbit") -or ($_ -eq "Tbit") -or ($_ -eq "Pbit") -or ($_ -eq "Ebit") -or ($_ -eq "Zbit") -or ($_ -eq "Ybit") } {
             $TransferSpeed = Get-IcingaNetworkInterfaceUnits -Value $Value;
-            return ([string]::Format('{0}{1}', $TransferSpeed.LinkSpeed, $TransferSpeed.Unit));
+            return ([string]::Format('{0}{1}', $TransferSpeed.LinkSpeed, $TransferSpeed.Unit)).Replace(',', '.');
         };
         { ($_ -eq "B") -or ($_ -eq "KiB") -or ($_ -eq "MiB") -or ($_ -eq "GiB") -or ($_ -eq "TiB") -or ($_ -eq "PiB") -or ($_ -eq "EiB") -or ($_ -eq "ZiB") -or ($_ -eq "YiB") } {
-            return (ConvertTo-BytesNextUnit -Value $Value -Unit $Unit -Units @('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'));
+            return (ConvertTo-BytesNextUnit -Value $Value -Unit $Unit -Units @('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB')).Replace(',', '.');
         };
         { ($_ -eq "KB") -or ($_ -eq "MB") -or ($_ -eq "GB") -or ($_ -eq "TB") -or ($_ -eq "PB") -or ($_ -eq "EB") -or ($_ -eq "ZB") -or ($_ -eq "YB") } {
-            return (ConvertTo-BytesNextUnit -Value $Value -Unit $Unit -Units @('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'));
+            return (ConvertTo-BytesNextUnit -Value $Value -Unit $Unit -Units @('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB')).Replace(',', '.');
         };
         's' {
-            return (ConvertFrom-TimeSpan -Seconds $AdjustedValue)
+            return (ConvertFrom-TimeSpan -Seconds $AdjustedValue).Replace(',', '.')
         };
     }
 
-    return ([string]::Format('{0}{1}', $AdjustedValue, $Unit));
+    return ([string]::Format('{0}{1}', ([string]$AdjustedValue).Replace(',', '.'), $Unit));
 }
diff --git a/lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1 b/lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1
index 8147aec..0d767b9 100644
--- a/lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1
+++ b/lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1
@@ -402,7 +402,7 @@ function Compare-IcingaPluginThresholds()
 
     if ($UseDynamicPercentage -And $Unit -ne '%') {
         $IcingaThresholds.IcingaThreshold = $IcingaThresholds.PercentValue;
-        $PluginCurrentValue       = [string]::Format('{0}% ({1})', ([math]::Round($IcingaThresholds.Value, 2)), (Convert-IcingaPluginValueToString -Unit $Unit -Value $IcingaThresholds.RawValue -OriginalUnit $IcingaThresholds.OriginalUnit));
+        $PluginCurrentValue       = [string]::Format('{0}% ({1})', ([string]([math]::Round($IcingaThresholds.Value, 2))).Replace(',', '.'), (Convert-IcingaPluginValueToString -Unit $Unit -Value $IcingaThresholds.RawValue -OriginalUnit $IcingaThresholds.OriginalUnit));
         $PluginThresholdValue     = $IcingaThresholds.RawThreshold;
     }
 
@@ -411,11 +411,11 @@ function Compare-IcingaPluginThresholds()
 
     if ([string]::IsNullOrEmpty($IcingaThresholds.Message) -eq $FALSE) {
         $PluginOutputMessage.Append(' ') | Out-Null;
-        $PluginOutputMessage.Append($IcingaThresholds.Message) | Out-Null;
+        $PluginOutputMessage.Append($IcingaThresholds.Message.Replace(',', '.')) | Out-Null;
 
         if ([string]::IsNullOrEmpty($PluginThresholdValue) -eq $FALSE) {
             $PluginOutputMessage.Append(' ') | Out-Null;
-            $PluginOutputMessage.Append($PluginThresholdValue) | Out-Null;
+            $PluginOutputMessage.Append(([string]$PluginThresholdValue).Replace(',', '.')) | Out-Null;
         }
     }