diff --git a/src/Generator/OutputGeneratorTrait.php b/src/Generator/OutputGeneratorTrait.php
index eb87eb4..f011694 100644
--- a/src/Generator/OutputGeneratorTrait.php
+++ b/src/Generator/OutputGeneratorTrait.php
@@ -60,7 +60,7 @@ protected function createResponseDenormalizationStatement($status, $schema, Cont
                         new Expr\PropertyFetch(new Expr\Variable('this'), 'serializer'),
                         'deserialize',
                         [
-                            new Arg(new Expr\MethodCall(new Expr\MethodCall(new Expr\Variable('response'), 'getBody'), 'getContents')),
+                            new Arg(new Expr\Cast\String_(new Expr\MethodCall(new Expr\Variable('response'), 'getBody'))),
                             new Arg(new Scalar\String_($class)),
                             new Arg(new Scalar\String_('json'))
                         ]
diff --git a/tests/fixtures/model-in-response/expected/Resource/TestResource.php b/tests/fixtures/model-in-response/expected/Resource/TestResource.php
index f5280b4..1129609 100644
--- a/tests/fixtures/model-in-response/expected/Resource/TestResource.php
+++ b/tests/fixtures/model-in-response/expected/Resource/TestResource.php
@@ -24,13 +24,13 @@ public function getTest($parameters = [], $fetch = self::FETCH_OBJECT)
         $response   = $this->httpClient->sendRequest($request);
         if (self::FETCH_OBJECT == $fetch) {
             if ('200' == $response->getStatusCode()) {
-                return $this->serializer->deserialize($response->getBody()->getContents(), 'Joli\\Jane\\OpenApi\\Tests\\Expected\\Model\\Schema', 'json');
+                return $this->serializer->deserialize((string) $response->getBody(), 'Joli\\Jane\\OpenApi\\Tests\\Expected\\Model\\Schema', 'json');
             }
             if ('400' == $response->getStatusCode()) {
-                return $this->serializer->deserialize($response->getBody()->getContents(), 'Joli\\Jane\\OpenApi\\Tests\\Expected\\Model\\Error', 'json');
+                return $this->serializer->deserialize((string) $response->getBody(), 'Joli\\Jane\\OpenApi\\Tests\\Expected\\Model\\Error', 'json');
             }
             if ('404' == $response->getStatusCode()) {
-                return $this->serializer->deserialize($response->getBody()->getContents(), 'Joli\\Jane\\OpenApi\\Tests\\Expected\\Model\\Error', 'json');
+                return $this->serializer->deserialize((string) $response->getBody(), 'Joli\\Jane\\OpenApi\\Tests\\Expected\\Model\\Error', 'json');
             }
         }
 
@@ -54,7 +54,7 @@ public function getTestList($parameters = [], $fetch = self::FETCH_OBJECT)
         $response   = $this->httpClient->sendRequest($request);
         if (self::FETCH_OBJECT == $fetch) {
             if ('200' == $response->getStatusCode()) {
-                return $this->serializer->deserialize($response->getBody()->getContents(), 'Joli\\Jane\\OpenApi\\Tests\\Expected\\Model\\Schema[]', 'json');
+                return $this->serializer->deserialize((string) $response->getBody(), 'Joli\\Jane\\OpenApi\\Tests\\Expected\\Model\\Schema[]', 'json');
             }
         }