diff --git a/setup.rb b/setup.rb
index 4f1e198..618df9a 100644
--- a/setup.rb
+++ b/setup.rb
@@ -281,7 +281,6 @@ def multipackage_entries
     'site-ruby-common' => 'siteruby',     # For backward compatibility
     'site-ruby'        => 'siterubyver',  # For backward compatibility
     'bin-dir'          => 'bindir',
-    'bin-dir'          => 'bindir',
     'rb-dir'           => 'rbdir',
     'so-dir'           => 'sodir',
     'data-dir'         => 'datadir',