diff --git a/functions/public/Invoke-WPFImpex.ps1 b/functions/public/Invoke-WPFImpex.ps1
index 43d835de95..d97f025e03 100644
--- a/functions/public/Invoke-WPFImpex.ps1
+++ b/functions/public/Invoke-WPFImpex.ps1
@@ -57,6 +57,7 @@ function Invoke-WPFImpex {
             }
         }
 
+        $flattenedJson = [string]$flattenedJson
         Invoke-WPFPresets -preset $flattenedJson -imported $true
     }
 }