diff --git a/modules/openapi-generator/src/main/resources/powershell/api_client.mustache b/modules/openapi-generator/src/main/resources/powershell/api_client.mustache
index f760c7d5f56..2e6cb8647ce 100644
--- a/modules/openapi-generator/src/main/resources/powershell/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/powershell/api_client.mustache
@@ -233,8 +233,7 @@ function DeserializeResponse {
         [AllowEmptyString()]
         [string]$ReturnType,
         [Parameter(Mandatory)]
-        [AllowEmptyString()]
-        [string]$Response,
+        [Object]$Response,
         [Parameter(Mandatory)]
         [AllowEmptyCollection()]
         [string[]]$ContentTypes
diff --git a/samples/client/echo_api/powershell/src/PSOpenAPITools/Private/ApiClient.ps1 b/samples/client/echo_api/powershell/src/PSOpenAPITools/Private/ApiClient.ps1
index 06bd189facf..08c35f11b33 100644
--- a/samples/client/echo_api/powershell/src/PSOpenAPITools/Private/ApiClient.ps1
+++ b/samples/client/echo_api/powershell/src/PSOpenAPITools/Private/ApiClient.ps1
@@ -221,8 +221,7 @@ function DeserializeResponse {
         [AllowEmptyString()]
         [string]$ReturnType,
         [Parameter(Mandatory)]
-        [AllowEmptyString()]
-        [string]$Response,
+        [Object]$Response,
         [Parameter(Mandatory)]
         [AllowEmptyCollection()]
         [string[]]$ContentTypes
diff --git a/samples/client/petstore/powershell/src/PSPetstore/Private/PSApiClient.ps1 b/samples/client/petstore/powershell/src/PSPetstore/Private/PSApiClient.ps1
index 3b60185eee7..4bd3084c7e4 100755
--- a/samples/client/petstore/powershell/src/PSPetstore/Private/PSApiClient.ps1
+++ b/samples/client/petstore/powershell/src/PSPetstore/Private/PSApiClient.ps1
@@ -237,8 +237,7 @@ function DeserializeResponse {
         [AllowEmptyString()]
         [string]$ReturnType,
         [Parameter(Mandatory)]
-        [AllowEmptyString()]
-        [string]$Response,
+        [Object]$Response,
         [Parameter(Mandatory)]
         [AllowEmptyCollection()]
         [string[]]$ContentTypes