diff --git a/src/CodeCleaner/ReturnTypePass.php b/src/CodeCleaner/ReturnTypePass.php
index c9894fbd..05f54aa4 100644
--- a/src/CodeCleaner/ReturnTypePass.php
+++ b/src/CodeCleaner/ReturnTypePass.php
@@ -15,6 +15,7 @@
 use PhpParser\Node\Expr\Closure;
 use PhpParser\Node\Expr\ConstFetch;
 use PhpParser\Node\Identifier;
+use PhpParser\Node\Name;
 use PhpParser\Node\NullableType;
 use PhpParser\Node\Stmt\Function_;
 use PhpParser\Node\Stmt\Return_;
@@ -108,6 +109,10 @@ private function typeName(Node $node): string
             return \strtolower($node->name);
         }
 
+        if ($node instanceof Name) {
+            return strtolower($node->toString());
+        }
+
         throw new \InvalidArgumentException('Unable to find type name');
     }
 }