diff --git a/tools/upgrade.sh b/tools/upgrade.sh
index b6cb10b5a..afc6a98dd 100755
--- a/tools/upgrade.sh
+++ b/tools/upgrade.sh
@@ -164,6 +164,10 @@ git remote -v | while read remote url extra; do
   git@github.com:robbyrussell/oh-my-zsh(|.git))
     git remote set-url "$remote" "git@github.com:ohmyzsh/ohmyzsh.git"
     break ;;
+  # Update out-of-date "unauthenticated git protocol on port 9418" to https
+  git://github.com/robbyrussell/oh-my-zsh(|.git))
+    git remote set-url "$remote" "https://github.com/ohmyzsh/ohmyzsh.git"
+    break ;;
   esac
 done