--- pipenv/core.py.orig	2018-02-24 15:59:51 UTC

+++ pipenv/core.py

@@ -1217,6 +1217,7 @@ def activate_virtualenv(source=True):

     # Support for csh shell.

     if PIPENV_SHELL and 'csh' in PIPENV_SHELL:

         suffix = '.csh'

+        command = 'source'

     # Escape any spaces located within the virtualenv path to allow

     # for proper activation.