diff --git a/lib/rb/thrift.gemspec b/lib/rb/thrift.gemspec
index bb32aa675b..8588ca75fc 100644
--- a/lib/rb/thrift.gemspec
+++ b/lib/rb/thrift.gemspec
@@ -19,11 +19,10 @@ Gem::Specification.new do |s|
 
   dir = File.expand_path(File.dirname(__FILE__))
 
-  s.files = Dir.glob("{lib,spec}/**/*")
-  s.test_files = Dir.glob("{test,spec,benchmark}/**/*")
+  s.files = Dir.glob("{lib,ext}/**/*.{c,h,rb}")
   s.executables = Dir.glob("{bin}/**/*")
 
-  s.extra_rdoc_files = %w[README.md] + Dir.glob("{ext,lib}/**/*.{c,h,rb}")
+  s.extra_rdoc_files = %w[README.md]
 
   s.require_paths = %w[lib ext]