diff --git a/ext/extconf.rb b/ext/extconf.rb
index 4ba4e63..313ebda 100755
--- a/ext/extconf.rb
+++ b/ext/extconf.rb
@@ -1,4 +1,4 @@
-#!/usr/env ruby
+#!/usr/bin/env ruby
 #/usr/local/bin/ruby
 =begin
 create Makefile script for Ruby/OpenCV