--- a/src/ruby/ext/grpc/extconf.rb
+++ b/src/ruby/ext/grpc/extconf.rb
@@ -27,6 +27,7 @@ ENV['MACOSX_DEPLOYMENT_TARGET'] = '10.7'
 if ENV['AR'].nil? || ENV['AR'].size == 0
     ENV['AR'] = RbConfig::CONFIG['AR'] + ' rcs'
 end
+ENV['AR'] = ENV['AR'] + ' rcs'
 if ENV['CC'].nil? || ENV['CC'].size == 0
     ENV['CC'] = RbConfig::CONFIG['CC']
 end