diff --git a/lib/activerecord-import/base.rb b/lib/activerecord-import/base.rb
index 5553e38..6c5e353 100644
--- a/lib/activerecord-import/base.rb
+++ b/lib/activerecord-import/base.rb
@@ -23,6 +23,6 @@ end
 
 
 this_dir = Pathname.new File.dirname(__FILE__)
-require this_dir.join("import")
-require this_dir.join("active_record/adapters/abstract_adapter")
-require this_dir.join("synchronize")
\ No newline at end of file
+require this_dir.join("import").to_s
+require this_dir.join("active_record/adapters/abstract_adapter").to_s
+require this_dir.join("synchronize").to_s
\ No newline at end of file