diff --git a/lib/envied.rb b/lib/envied.rb
index 298628c..f0f07bf 100644
--- a/lib/envied.rb
+++ b/lib/envied.rb
@@ -4,7 +4,6 @@
 require 'envied/coercer'
 require 'envied/coercer/envied_string'
 require 'envied/variable'
-require 'envied/type'
 require 'envied/configuration'
 
 class ENVied
diff --git a/lib/envied/coercer.rb b/lib/envied/coercer.rb
index c12858d..303842f 100644
--- a/lib/envied/coercer.rb
+++ b/lib/envied/coercer.rb
@@ -7,45 +7,55 @@ class ENVied::Coercer
   SUPPORTED_TYPES = %i(hash array time date symbol boolean integer string uri float).freeze
 
   class << self
-    def built_in_type?(type)
-      SUPPORTED_TYPES.include?(type)
+    def base_type?(type)
+      name = type.to_sym.downcase
+      supported_types.include?(type)
     end
 
-    def custom_type?(type)
-      custom_types.key?(type)
+    def supported_types
+      SUPPORTED_TYPES
     end
+  end
 
-    # Custom types container.
-    #
-    # @example
-    #   ENVied::Coercer.custom_types[:json] =
-    #     ENVied::Type.new(:json, ->(str) { JSON.parse(str) })
-    #
-    # @return
-    def custom_types
-      @custom_types ||= {}
-    end
+  def_delegators :'self.class', :base_type?
 
-    def supported_types
-      SUPPORTED_TYPES + custom_types.keys
-    end
+  # Whether or not Coercer can coerce strings to the provided type.
+  #
+  # @param type [#to_sym] the type (case insensitive)
+  #
+  # @example
+  #   ENVied::Coercer.new.supported_type?('string')
+  #   # => true
+  #
+  # @return [Hash] of type names and their definitions.
+  def supported_type?(type)
+    self.class.base_type?(type) || custom_type?(type)
+  end
 
-    # Whether or not Coercer can coerce strings to the provided type.
-    #
-    # @param type [#to_sym] the type (case insensitive)
-    #
-    # @example
-    #   ENVied::Coercer.supported_type?('string')
-    #   # => true
-    #
-    # @return [Hash] of type names and their definitions.
-    def supported_type?(type)
-      name = type.to_sym.downcase
-      built_in_type?(name) || custom_type?(name)
-    end
+  # Whether or not Coercer has the provided type as a custom one.
+  #
+  # Custom data type can be registered using Configuration#type method.
+  #
+  # @param type [#to_sym] the type (case insensitive)
+  #
+  # @example
+  #   ENVied::Coercer.new.custom_type?('string')
+  #   # => false
+  #
+  # @return [Hash] of type names and their definitions.
+  def custom_type?(type)
+    name = type.to_sym.downcase
+    custom_types.include?(name)
   end
 
-  def_delegators :'self.class', :supported_type?, :supported_types, :custom_types
+  # List of custom types.
+  def custom_types
+    @custom_types ||= []
+  end
+
+  def supported_types
+    self.class.supported_types + custom_types
+  end
 
   # Coerce strings to specific type.
   #
@@ -58,18 +68,18 @@ def supported_type?(type)
   #
   # @return [type] the coerced string.
   def coerce(string, type)
-    if self.class.built_in_type?(type)
-      coerce_method_for(type.to_sym)[string]
-    elsif self.class.custom_type?(type)
-      custom_types[type].coerce(string)
-    else
-      raise ArgumentError, "#{type.inspect} is not supported type"
-    end
+    method = coerce_method_for(type)
+    raise ArgumentError, "#{type.inspect} is not supported type" unless method
+    method.call(string)
   end
 
   def coerce_method_for(type)
-    return nil unless supported_type?(type)
-    coercer.method("to_#{type.downcase}")
+    method_name = "to_#{type.downcase}"
+    if base_type?(type)
+      coercer.method(method_name)
+    elsif custom_type?(type)
+      method(method_name)
+    end
   end
 
   def coercer
diff --git a/lib/envied/configuration.rb b/lib/envied/configuration.rb
index f1bb22c..136ccc6 100644
--- a/lib/envied/configuration.rb
+++ b/lib/envied/configuration.rb
@@ -48,7 +48,8 @@ def variable(name, *args)
     end
 
     def type(name, &block)
-      coercer.custom_types[name] = Type.new(name, block)
+      coercer.custom_types.push(name.to_sym).uniq!
+      coercer.define_singleton_method("to_#{name}", &block)
     end
 
     def group(*names, &block)
diff --git a/lib/envied/type.rb b/lib/envied/type.rb
deleted file mode 100644
index a3745ec..0000000
--- a/lib/envied/type.rb
+++ /dev/null
@@ -1,22 +0,0 @@
-class ENVied::Type
-  attr_reader :name
-
-  def initialize(name, coercer)
-    @name = name
-    @coercer = coercer
-  end
-
-  def coerce(value)
-    coercer.call(value)
-  end
-
-  def ==(other)
-    self.class == other.class &&
-      name == other.name &&
-      coercer == other.coercer
-  end
-
-  protected
-
-  attr_reader :coercer
-end
diff --git a/spec/coercer_spec.rb b/spec/coercer_spec.rb
index ef0095c..3f0fb38 100644
--- a/spec/coercer_spec.rb
+++ b/spec/coercer_spec.rb
@@ -125,13 +125,10 @@ def coerce_to(type)
       let(:coerce) { coerce_to(:json) }
 
       before do
-        coercer.custom_types[:json] =
-          ENVied::Type.new(
-            :json,
-            lambda do |raw_string|
-              JSON.parse(raw_string)
-            end
-          )
+        coercer.custom_types.push(:json)
+        coercer.define_singleton_method("to_json") do |raw_string|
+          JSON.parse(raw_string)
+        end
       end
 
       it 'converts strings to defined custom type' do
diff --git a/spec/configuration_spec.rb b/spec/configuration_spec.rb
index dd11149..4df571d 100644
--- a/spec/configuration_spec.rb
+++ b/spec/configuration_spec.rb
@@ -41,7 +41,7 @@
   end
 
   describe '#type' do
-    subject { config.coercer.custom_types }
+    # subject { config.coercer.custom_types }
 
     let(:coercer) { ->(raw_string) { Integer(raw_string) ** 2 } }
     let(:config) do
@@ -51,8 +51,12 @@
       end
     end
 
-    it 'creates type with given coercing block' do
-      is_expected.to include(power_integer: ENVied::Type.new(:power_integer, coercer))
+    it 'registers new custom method' do
+      expect(config.coercer).to respond_to(:to_power_integer)
+    end
+
+    it 'defines new coercing method in coercer instance' do
+      expect(config.coercer.method(:to_power_integer).source).to eq(coercer.source)
     end
   end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 8d4c188..247001b 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -4,9 +4,4 @@
 
 $:.unshift File.expand_path("../../lib", __FILE__)
 require 'envied'
-
-RSpec.configure do |config|
-  config.before do
-    ENVied::Coercer.custom_types.clear
-  end
-end
+require 'pry'