diff --git a/do.nu b/do.nu
old mode 100644
new mode 100755
index 2c3ee04..066841d
--- a/do.nu
+++ b/do.nu
@@ -1,3 +1,5 @@
+#!/usr/bin/env nu
+
 # Build the frontend dans backend in parallel (debug mode).
 def "main build" [] {
     build