diff --git a/Scripts/speak-german.ps1 b/Scripts/speak-german.ps1
index a31bfd3f..7889390c 100755
--- a/Scripts/speak-german.ps1
+++ b/Scripts/speak-german.ps1
@@ -11,7 +11,7 @@
 	Author: Markus Fleschutz / License: CC0
 #>
 
-param($Text = "")
+param([string]$Text = "")
 if ($Text -eq "") { $Text = read-host "Enter the text to speak" }
 
 try {