diff --git a/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache b/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
index 6639723ec508..4bf90bb13f6f 100644
--- a/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
+++ b/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
@@ -340,7 +340,7 @@ class ObjectSerializer
         } elseif (is_bool($value)) {
             return $value ? 'true' : 'false';
         } else {
-            return (string) $value;
+            return $value;
         }
     }
 
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php b/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
index 611a2b9144c1..65bf80785173 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
@@ -349,7 +349,7 @@ public static function toString($value)
         } elseif (is_bool($value)) {
             return $value ? 'true' : 'false';
         } else {
-            return (string) $value;
+            return $value;
         }
     }
 
diff --git a/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php b/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
index 611a2b9144c1..65bf80785173 100644
--- a/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
@@ -349,7 +349,7 @@ public static function toString($value)
         } elseif (is_bool($value)) {
             return $value ? 'true' : 'false';
         } else {
-            return (string) $value;
+            return $value;
         }
     }