diff --git a/src/Framework/MockObject/MockMethod.php b/src/Framework/MockObject/MockMethod.php
index 2388d157cc2..69e50b2fb73 100644
--- a/src/Framework/MockObject/MockMethod.php
+++ b/src/Framework/MockObject/MockMethod.php
@@ -346,7 +346,7 @@ private static function deriveReturnType(ReflectionMethod $method): Type
         $returnType = $method->getReturnType();
 
         if ($returnType === null) {
-            return new UnknownType();
+            return new UnknownType;
         }
 
         // @see https://bugs.php.net/bug.php?id=70722