diff --git a/Rakefile b/Rakefile
index f9b4ca0..600fa17 100644
--- a/Rakefile
+++ b/Rakefile
@@ -2,7 +2,7 @@ require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new(:test) do |spec|
-  spec.pattern = 'spec/*.rb'
+  spec.pattern = 'spec/*_spec.rb'
   spec.rspec_opts = ['--color']
 end