diff --git a/tools/install_venv.py b/tools/install_venv.py
index 8e7acfe8be..bdf238a751 100644
--- a/tools/install_venv.py
+++ b/tools/install_venv.py
@@ -39,7 +39,7 @@ def print_help():
  To activate the Neutron virtualenv for the extent of your current shell
  session you can run:
 
- $ source .venv/bin/activate
+ $ . .venv/bin/activate
 
  Or, if you prefer, you can run commands in the virtualenv on a case by case
  basis by running: