diff --git a/Rakefile.rb b/Rakefile.rb
index ae41c18..9896808 100644
--- a/Rakefile.rb
+++ b/Rakefile.rb
@@ -35,7 +35,7 @@ task :dspec, [:example_string] => :build_dist do |task, args|
   FileUtils.mkdir_p("test")
   FileUtils.cp("dist/rscons", "test/rscons.rb")
   ENV["dist_specs"] = "1"
-  Rake::Task["spec"].execute(args.example_string)
+  Rake::Task["spec"].execute(args)
   ENV.delete("dist_specs")
   FileUtils.rm_f(Dir.glob(".rscons-*"))
 end