diff --git a/tools/install_venv.py b/tools/install_venv.py
index b7b93a24..8dc175fe 100644
--- a/tools/install_venv.py
+++ b/tools/install_venv.py
@@ -34,7 +34,7 @@ def print_help(venv, root):
     To activate the Murano agent virtualenv for the extent of your current
     shell session you can run:
 
-    $ source %s/bin/activate
+    $ . %s/bin/activate
 
     Or, if you prefer, you can run commands in the virtualenv on a case by
     case basis by running: