diff --git a/pipenvlib.py b/pipenvlib.py
index 1f85dfd..f9d644d 100644
--- a/pipenvlib.py
+++ b/pipenvlib.py
@@ -167,9 +167,6 @@ class PipenvProject(object):
 
         return [l for l in gen()]
 
-    def _assert_pipenv_is_installed(self):
-        pass
-
     def _run(self, cmd):
         """Run a Pipenv command for the Pipenv project.."""
         return delegator.run('pipenv {0}'.format(cmd), cwd=self.home)