diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index 17af887abc6e08035a192e9fcc8feb89208574e6..fb213dc6f76297adffc7a007f60fff139ec4d7ff 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -535,7 +535,6 @@ def where_values_hash
       }
 
       binds = Hash[bind_values.find_all(&:first).map { |column, v| [column.name, v] }]
-      binds.merge!(Hash[bind_values.find_all(&:first).map { |column, v| [column.name, v] }])
 
       Hash[equalities.map { |where|
         name = where.left.name