diff --git a/Statistics/Measure-Object.ps1 b/Statistics/Measure-Object.ps1
index 42de1c7..3a2c288 100644
--- a/Statistics/Measure-Object.ps1
+++ b/Statistics/Measure-Object.ps1
@@ -59,7 +59,7 @@
 
         #region Calculate standard deviation
         $StandardDeviation = [math]::Sqrt($Stats.Variance)
-        Add-Member -InputObject $Stats -MemberType NoteProperty -Name 'StandardDeviation' -Value $StandardDeviation
+        Add-Member -InputObject $Stats -MemberType NoteProperty -Name 'StandardDeviation' -Value $StandardDeviation -Force
         #endregion
 
         #region Calculate percentiles
@@ -96,4 +96,4 @@
     }
 }
 
-New-Alias -Name mo -Value Measure-Object -Force
\ No newline at end of file
+New-Alias -Name mo -Value Measure-Object -Force