diff --git a/.ci/detect_os_arch_package_format b/.ci/detect_os_arch_package_format
index a724edf..0ff837c 100755
--- a/.ci/detect_os_arch_package_format
+++ b/.ci/detect_os_arch_package_format
@@ -1,4 +1,4 @@
-#!/usr/bin/env ruby.
+#!/usr/bin/env ruby
 
 package_name = ARGV.first