diff --git a/lib/icinga/plugin/New-IcingaCheckResult.psm1 b/lib/icinga/plugin/New-IcingaCheckResult.psm1
index bc4dba1..d205e53 100644
--- a/lib/icinga/plugin/New-IcingaCheckResult.psm1
+++ b/lib/icinga/plugin/New-IcingaCheckResult.psm1
@@ -4,7 +4,7 @@ function New-IcingaCheckresult()
 {
     param(
         $Check,
-        [switch]$NoPerfData,
+        [bool]$NoPerfData,
         [switch]$Compile
     );