diff --git a/src/DefinitionResolver.php b/src/DefinitionResolver.php
index 83f7898..17e8315 100644
--- a/src/DefinitionResolver.php
+++ b/src/DefinitionResolver.php
@@ -745,10 +745,8 @@ class DefinitionResolver
                 if (is_string($node->type)) {
                     // Resolve a string like "bool" to a type object
                     $type = $this->typeResolver->resolve($node->type);
-                } else if ($node->returnType instanceof Node\Name) {
-                    $type = (string)$node->returnType;
-
-                    if (strtolower($type) === 'self') {
+                } else if ($node->type instanceof Node\Name) {
+                    if (strtolower($node->type) === 'self') {
                         // handle self reference
                         $class = getClosestNode($node, Node\Stmt\Class_::class);