diff --git a/tasks/ext_helper.rb b/tasks/ext_helper.rb
old mode 100644
new mode 100755
index c2b8a004..5729f104
--- a/tasks/ext_helper.rb
+++ b/tasks/ext_helper.rb
@@ -58,7 +58,7 @@ def setup_c_extension(extension_name, gem_spec = nil)
 
         # add the precompiled binaries to the list of files
         # (taken from compile task dependency)
-        gem_spec.files += Rake::Task['compile'].prerequisites
+        gem_spec.files += ["lib/#{ext_name}"]
       end
     end
   end