diff --git a/Invoke-BalloonTip.ps1 b/Invoke-BalloonTip.ps1
index a6af564..9750d8f 100644
--- a/Invoke-BalloonTip.ps1
+++ b/Invoke-BalloonTip.ps1
@@ -43,7 +43,7 @@
          [string]$Title="Attention $env:username",
 
         [Parameter(HelpMessage="The message type: Info,Error,Warning,None")]
-        [System.Windows.Forms.ToolTipIcon]$MessageType="Info",
+        [string]$MessageType="Info",
      
         [Parameter(HelpMessage="The path to a file to use its icon in the system tray")]
         [string]$SysTrayIconPath='C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe',     
@@ -85,4 +85,4 @@
 
     Write-Verbose "Ending function"
 
-}
\ No newline at end of file
+}