diff --git a/.ci/detect_os_arch_package_format b/.ci/detect_os_arch_package_format
index ba1dd55..a724edf 100755
--- a/.ci/detect_os_arch_package_format
+++ b/.ci/detect_os_arch_package_format
@@ -1,6 +1,4 @@
-#!/usr/bin/ruby
-
-which ruby
+#!/usr/bin/env ruby.
 
 package_name = ARGV.first