diff --git a/modules/python/init.zsh b/modules/python/init.zsh
index b373028..458253b 100644
--- a/modules/python/init.zsh
+++ b/modules/python/init.zsh
@@ -38,7 +38,7 @@ fi
 zstyle -t ':prezto:module:python' skip-virtualenvwrapper-init
 if (( $? && $+commands[virtualenvwrapper.sh] )); then
   # Set the directory where virtual environments are stored.
-  export WORKON_HOME="$HOME/.virtualenvs"
+  export WORKON_HOME="${WORKON_HOME:-$HOME/.virtualenvs}"
 
   # Disable the virtualenv prompt.
   VIRTUAL_ENV_DISABLE_PROMPT=1