diff --git a/tools/upgrade.sh b/tools/upgrade.sh
index 55768cd6e..3005e6542 100644
--- a/tools/upgrade.sh
+++ b/tools/upgrade.sh
@@ -33,7 +33,7 @@ git config receive.fsck.zeroPaddedFilemode ignore
 
 # Update upstream remote to ohmyzsh org
 remote=$(git remote -v | awk '/https:\/\/github\.com\/robbyrussell\/oh-my-zsh\.git/{ print $1; exit }')
-if [[ -n "$remote" ]]; then
+if [ -n "$remote" ]; then
   git remote set-url "$remote" "https://github.com/ohmyzsh/ohmyzsh.git"
 fi