diff --git a/encrypt-key.ps1 b/encrypt-key.ps1
index 9d7da09..4e3339b 100644
--- a/encrypt-key.ps1
+++ b/encrypt-key.ps1
@@ -2,11 +2,23 @@
 [CmdletBinding()]
 param(
     [switch]$UpdateConfig,
-    [string]$ConfigPath = (Join-Path $PSScriptRoot 'appsettings.Development.json')
+    [string]$ConfigPath
 )
 
 $ErrorActionPreference = 'Stop'
 
+if ([string]::IsNullOrWhiteSpace($ConfigPath)) {
+    $scriptDirectory = $PSScriptRoot
+    if ([string]::IsNullOrWhiteSpace($scriptDirectory) -and
+        -not [string]::IsNullOrWhiteSpace($MyInvocation.MyCommand.Path)) {
+        $scriptDirectory = Split-Path -Parent $MyInvocation.MyCommand.Path
+    }
+    if ([string]::IsNullOrWhiteSpace($scriptDirectory)) {
+        throw 'Cannot determine the script directory. Specify -ConfigPath with the full config path.'
+    }
+    $ConfigPath = Join-Path $scriptDirectory 'appsettings.Development.json'
+}
+
 function ConvertTo-EncryptedValue {
     param(
         [Security.SecureString]$Value,