diff --git a/lib/enum/enum.rb b/lib/enum/enum.rb
index fef6665..6f07ebc 100644
--- a/lib/enum/enum.rb
+++ b/lib/enum/enum.rb
@@ -15,14 +15,14 @@ def enum_accessor(*field_names)
       end
 
       def enum(columns)
+        method_definitions = []
         columns.each do |column, values|
           values = values.zip(values.map(&:to_s)).to_h if values.is_a?(Array)
           values.each do |method, value|
-            define_method("#{method}?") do
-              send(column) == value
-            end
+            method_definitions << "def #{method}?; #{column} == '#{value}'; end"
           end
         end
+        class_eval(method_definitions.uniq.join(";"))
       end
 
       def insert(record)