diff --git a/pipdeptree.py b/pipdeptree.py
index eaf3ec2..095c685 100644
--- a/pipdeptree.py
+++ b/pipdeptree.py
@@ -51,7 +51,7 @@ def non_top_pkg_name(req, pkg):
     if not vers:
         return req.key
     ver_str = ', '.join(['{}: {}'.format(k, v) for k, v in vers])
-    return '{} [{}]'.format(req.project_name, ver_str)
+    return '{} [{}]'.format(pkg.project_name, ver_str)
 
 
 def render_tree(pkgs, list_all):