diff --git a/openapi-generator/templates/php/ObjectSerializer.mustache b/openapi-generator/templates/php/ObjectSerializer.mustache
index c6d80ce1..aa4f3302 100644
--- a/openapi-generator/templates/php/ObjectSerializer.mustache
+++ b/openapi-generator/templates/php/ObjectSerializer.mustache
@@ -286,9 +286,6 @@ class ObjectSerializer
             } else {
                 return null;
             }
-        } elseif (in_array($class, [{{&primitives}}], true)) {
-            settype($data, $class);
-            return $data;
         } elseif ($class === '\SplFileObject') {
             /** @var \Psr\Http\Message\StreamInterface $data */
 
@@ -307,6 +304,9 @@ class ObjectSerializer
             fclose($file);
 
             return new \SplFileObject($filename, 'r');
+        } elseif (in_array($class, [{{&primitives}}], true)) {
+            settype($data, $class);
+            return $data;
         } elseif (method_exists($class, 'getAllowableEnumValues')) {
             if (!in_array($data, $class::getAllowableEnumValues(), true)) {
                 $imploded = implode("', '", $class::getAllowableEnumValues());