diff --git a/lib/icinga/plugin/New-IcingaCheck.psm1 b/lib/icinga/plugin/New-IcingaCheck.psm1
index 780915d..89d8bf7 100644
--- a/lib/icinga/plugin/New-IcingaCheck.psm1
+++ b/lib/icinga/plugin/New-IcingaCheck.psm1
@@ -471,6 +471,8 @@ function New-IcingaCheck()
 
         if ((Test-Numeric $checkValue)) {
             $checkValue = [int]$checkValue;
+        } else {
+            $checkValue = [string]$checkValue;
         }
 
         if ($this.translation.ContainsKey($checkValue)) {