diff --git a/ext/etc/etc.gemspec b/ext/etc/etc.gemspec
index 98c6d66faa..3facc74866 100644
--- a/ext/etc/etc.gemspec
+++ b/ext/etc/etc.gemspec
@@ -24,7 +24,8 @@ Gem::Specification.new do |spec|
 
   changelogs = Dir.glob("logs/ChangeLog-[1-9]*[^~]", base: __dir__)
   spec.files         = %w[
-    LICENSE.txt
+    BSDL
+    COPYING
     README.md
     ChangeLog
     ext/etc/constdefs.h