diff --git a/mongo-extensions.gemspec b/mongo-extensions.gemspec
index bfd19fd..63f9d22 100644
--- a/mongo-extensions.gemspec
+++ b/mongo-extensions.gemspec
@@ -10,7 +10,7 @@ Gem::Specification.new do |s|
 
   s.require_paths = ['ext']
   s.files = ['Rakefile', 'mongo-extensions.gemspec']
-  s.files += Dir['ext/**/*.rb'] + Dir['ext/**/*.c']
+  s.files += Dir['ext/**/*.rb'] + Dir['ext/**/*.c'] + Dir['ext/**/*.h']
   s.test_files = []
 
   s.has_rdoc = false