diff --git a/lib/drb/drb.gemspec b/lib/drb/drb.gemspec
index 15e693f57a..0ac525705b 100644
--- a/lib/drb/drb.gemspec
+++ b/lib/drb/drb.gemspec
@@ -40,4 +40,6 @@ Gem::Specification.new do |spec|
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
+
+  spec.add_dependency "ruby2_keywords"
 end