diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 20e3514ce6..ceb483e5d4 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,7 +20,7 @@ cask-repair --help
 
 # fork homebrew-cask to your account - only needed once
 cd "$(brew --repository)/Library/Taps/caskroom/homebrew-cask/Casks"
-git config hub.protocol https
+git config --local hub.protocol https
 hub fork
 
 # use to update <outdated_cask>