diff --git a/run.lua b/run.lua
old mode 100644
new mode 100755
index 3d637e74..4d0764be
--- a/run.lua
+++ b/run.lua
@@ -1,3 +1,5 @@
+#!/usr/bin/env lua
+
 -- Running tests and/or examples.
 local lfs = require "lfs"