diff --git a/activerecord/lib/active_record/validations.rb b/activerecord/lib/active_record/validations.rb
index 5e9608f9db1971bbc1400582fba15f9826822db9..39eb6c013b55717f814309dc4037e5266a5c9dff 100755
--- a/activerecord/lib/active_record/validations.rb
+++ b/activerecord/lib/active_record/validations.rb
@@ -213,9 +213,9 @@ def validates_uniqueness_of(*attr_names)
 
         for attr_name in attr_names
           if scope = configuration[:scope]
-            class_eval(%(validate %{errors.add('#{attr_name}', '#{configuration[:message]}') if self.class.find_first(new_record? ? ['#{attr_name} = ? AND #{scope} = ?', #{attr_name}, #{scope}] : ["#{attr_name} = ? AND \#{primary_key} <> ? AND #{scope} = ?", #{attr_name}, id, #{scope}])}))
+            class_eval(%(validate %{errors.add('#{attr_name}', '#{configuration[:message]}') if self.class.find_first(new_record? ? ['#{attr_name} = ? AND #{scope} = ?', #{attr_name}, #{scope}] : ["#{attr_name} = ? AND \\\#{self.class.primary_key} <> ? AND #{scope} = ?", #{attr_name}, id, #{scope}])}))
           else
-            class_eval(%(validate %{errors.add('#{attr_name}', '#{configuration[:message]}') if self.class.find_first(new_record? ? ['#{attr_name} = ?', #{attr_name}] : ["#{attr_name} = ? AND \#{primary_key} <> ?", #{attr_name}, id])}))
+            class_eval(%(validate %{errors.add('#{attr_name}', '#{configuration[:message]}') if self.class.find_first(new_record? ? ['#{attr_name} = ?', #{attr_name}] : ["#{attr_name} = ? AND \\\#{self.class.primary_key} <> ?", #{attr_name}, id])}))
           end
         end
       end