diff --git a/script/init-local-index.sh b/script/init-local-index.sh
index 0ca74a79485..65d4f3e5cd5 100755
--- a/script/init-local-index.sh
+++ b/script/init-local-index.sh
@@ -11,10 +11,10 @@ mkdir -p tmp
 rm -rf tmp/index-bare tmp/index-tmp
 
 echo "Initializing repository in tmp/index-bare..."
-git init -q --bare tmp/index-bare
+git init -q --bare --initial-branch=master tmp/index-bare
 
 echo "Creating temporary clone in tmp/index-tmp..."
-git init -q tmp/index-tmp
+git init -q --initial-branch=master tmp/index-tmp
 cd tmp/index-tmp
 cat > config.json <<-EOF
 {