diff --git a/pipdeptree.py b/pipdeptree.py
index efc32ff..a8dfcce 100644
--- a/pipdeptree.py
+++ b/pipdeptree.py
@@ -19,7 +19,7 @@ try:
 except ImportError:
     from pip import get_installed_distributions, FrozenRequirement
 
-import pkg_resources
+from pip._vendor import pkg_resources
 # inline:
 # from graphviz import backend, Digraph