diff --git a/MANIFEST b/MANIFEST
index a7d970a89b..5bff3727c3 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -201,6 +201,7 @@ lib/optparse/date.rb
 lib/optparse/shellwords.rb
 lib/optparse/time.rb
 lib/optparse/uri.rb
+lib/optparse/version.rb
 lib/ostruct.rb
 lib/parsearg.rb
 lib/parsedate.rb