diff --git a/doc/source/contributor/dev.rst b/doc/source/contributor/dev.rst
index 97b73737c..7da9b524d 100644
--- a/doc/source/contributor/dev.rst
+++ b/doc/source/contributor/dev.rst
@@ -56,7 +56,7 @@ installed as well.
 
     # Create and activate a virtual environment
     virtualenv .barbicanenv
-    source .barbicanenv/bin/activate
+    . .barbicanenv/bin/activate
 
     # Install barbican in development mode
     pip install -e $PWD