diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 8a1b6c9..dbc97ad 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,7 @@
 require "simplecov"
 
-SimpleCov.start
+SimpleCov.start do
+  add_filter "/spec/"
+end
 
 require "rscons"