diff --git a/Tools/publish_to_github.ps1 b/Tools/publish_to_github.ps1
index 470658cb9..7df25e444 100644
--- a/Tools/publish_to_github.ps1
+++ b/Tools/publish_to_github.ps1
@@ -29,18 +29,20 @@ param (
     #
     $Description,
 
-    [bool]
+    [string]
     [Parameter(Mandatory=$true)]
-    #
+    # true/false
     $IsDraft,
 
-    [bool]
+    [string]
     [Parameter(Mandatory=$true)]
-    #
+    [ValidateSet("true","false")]
+    # true/false
     $IsPrerelease,
 
     [string]
     [Parameter(Mandatory=$true)]
+    [ValidateSet("true","false")]
     # Path to the zip file to upload with the release
     $ZipFilePath,