diff --git a/Public/Merge-DSCConfigurationData.ps1 b/Public/Merge-DSCConfigurationData.ps1
index 0a7d1c6..414a3b1 100644
--- a/Public/Merge-DSCConfigurationData.ps1
+++ b/Public/Merge-DSCConfigurationData.ps1
@@ -4,9 +4,9 @@ function Merge-DSCConfigurationData {
         [Parameter(Mandatory=$true)]
         [System.Collections.Hashtable]
         $Template,
-        [Parameter(Mandatory=$true)]
+        [Parameter(Mandatory=$false)]
         [System.Collections.Hashtable]
-        $Deployment,
+        $Deployment = @{},
         [Parameter(Mandatory=$false)]
         [System.Collections.Hashtable]
         $Output