diff --git a/rubygem-abstract_method.spec b/rubygem-abstract_method.spec
index 0cafae0..1c03b7e 100644
--- a/rubygem-abstract_method.spec
+++ b/rubygem-abstract_method.spec
@@ -10,7 +10,7 @@ BuildRequires:  ruby(release) rubygems-devel
 # BuildRequires:  rubygem-gem2rpm
 BuildRequires:       rubygems-devel rubygem(rspec) >= 3 rubygem(did_you_mean)
 Url:            https://github.com/openSUSE/abstract_method
-Source:         http://rubygems.org/gems/%{mod_full_name}.gem
+Source0:         http://rubygems.org/gems/%{mod_full_name}.gem
 Summary:        Tiny library enabling you to define abstract methods in Ruby classes
 License:        MIT
 Group:          Development/Languages/Ruby
@@ -18,10 +18,12 @@ Group:          Development/Languages/Ruby
 %description
 Abstract Method is a tiny library enabling you to define abstract methods in
 Ruby classes and modules.
-
+# maybe we have to follow other packages' routine
 %prep
-
+%auto setup -n %{mod_full_name} -p1
+gem unpack %{SOURCE0}
 %build
+gem build ../%{mod_full_name}.gemspec
 %gem_install
 %install
 mkdir -p %{buildroot}%{gem_dir}