diff --git a/launch-cluster.sh b/launch-cluster.sh
index 17f6949..97d4da0 100755
--- a/launch-cluster.sh
+++ b/launch-cluster.sh
@@ -559,7 +559,7 @@ make_node_script() {
 
     local tmp; tmp=$(mktemp /tmp/vllm_node_script_XXXXXX.sh)
     grep -v -- '--distributed-executor-backend' "$script_path" > "$tmp"
-    echo "$extra" >> "$tmp"
+    sed -i "$ s/$/ $extra/" "$tmp"
     chmod +x "$tmp"
     echo "$tmp"
 }