diff --git a/pipenv/environments.py b/pipenv/environments.py
index c5bf94c6..f56af88c 100644
--- a/pipenv/environments.py
+++ b/pipenv/environments.py
@@ -51,4 +51,4 @@ PIPENV_TIMEOUT = int(os.environ.get('PIPENV_TIMEOUT', 120))
 
 PIPENV_INSTALL_TIMEOUT = 60 * 15
 
-PYENV_INSTALLED = os.environ.get('PYENV_ROOT')
\ No newline at end of file
+PYENV_INSTALLED = bool(os.environ.get('PYENV_SHELL'))