diff --git a/.travis.yml b/.travis.yml
index f2564bf..7e6be1d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ matrix:
         - php: 7.2
           env: deps=lowest
         - php: 7.3
+        - php: 7.4
 
 install:
     - if [ -z "$deps" ]; then composer install; fi;
diff --git a/src/ReflectionMethod.php b/src/ReflectionMethod.php
index f9c7779..100a644 100644
--- a/src/ReflectionMethod.php
+++ b/src/ReflectionMethod.php
@@ -75,7 +75,7 @@ public function getReturnType()
 
         if ($type = $this->method->getReturnType()) {
             // Self is not valid when used in different places.
-            if ('self' === $type->__toString()) {
+            if ('self' === $type->getName()) {
                 return null;
             }
 
diff --git a/src/ReflectionType.php b/src/ReflectionType.php
index 4bc136b..4b7cb8b 100644
--- a/src/ReflectionType.php
+++ b/src/ReflectionType.php
@@ -15,7 +15,7 @@ public function __construct(\ReflectionType $type)
 
     public function getName()
     {
-        $name = (string) $this->type;
+        $name = $this->type->getName();
 
         // Some types can not be qualified
         if (in_array($name, self::NON_QUALIFIED_TYPES, true)) {