diff --git a/lib/veritas/algebra/rename.rb b/lib/veritas/algebra/rename.rb
index <HASH>..<HASH> 100644
--- a/lib/veritas/algebra/rename.rb
+++ b/lib/veritas/algebra/rename.rb
@@ -11,7 +11,7 @@ module Veritas
       end
 
       def header
-        @header ||= relation.header.rename(@aliases)
+        @header ||= relation.header.rename(aliases)
       end
 
       def each(&block)
Use the accessor rather than the ivar name in Rename#header