diff --git a/index.mjs b/index.mjs
index 2c1c05c..206b653 100755
--- a/index.mjs
+++ b/index.mjs
@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 // KaTeX rendering server
 // Listens on unix socket, path is provided as first argument
 // Expects JSON lines, each line is a query with the following schema: