diff --git a/lib/oga.rb b/lib/oga.rb
index 797fab7..b53f8da 100644
--- a/lib/oga.rb
+++ b/lib/oga.rb
@@ -34,6 +34,7 @@ require_relative 'oga/xml/xml_declaration'
 require_relative 'oga/xml/processing_instruction'
 require_relative 'oga/xml/doctype'
 require_relative 'oga/xml/namespace'
+require_relative 'oga/xml/default_namespace'
 require_relative 'oga/xml/attribute'
 require_relative 'oga/xml/element'
 require_relative 'oga/xml/node_set'
diff --git a/lib/oga/xml/attribute.rb b/lib/oga/xml/attribute.rb
index d291c4f..9a227de 100644
--- a/lib/oga/xml/attribute.rb
+++ b/lib/oga/xml/attribute.rb
@@ -21,17 +21,6 @@ module Oga
     class Attribute
       attr_accessor :name, :namespace_name, :element, :value
 
-      ##
-      # The default namespace available to all attributes. This namespace can
-      # not be modified.
-      #
-      # @return [Oga::XML::Namespace]
-      #
-      DEFAULT_NAMESPACE = Namespace.new(
-        :name => 'xml',
-        :uri  => 'http://www.w3.org/XML/1998/namespace'
-      ).freeze
-
       ##
       # @param [Hash] options
       #
diff --git a/lib/oga/xml/default_namespace.rb b/lib/oga/xml/default_namespace.rb
new file mode 100644
index 0000000..fab44b4
--- /dev/null
+++ b/lib/oga/xml/default_namespace.rb
@@ -0,0 +1,13 @@
+module Oga
+  module XML
+    ##
+    # The default XML namespace.
+    #
+    # @return [Oga::XML::Namespace]
+    #
+    DEFAULT_NAMESPACE = Namespace.new(
+      :name => 'xml',
+      :uri  => 'http://www.w3.org/XML/1998/namespace'
+    ).freeze
+  end # XML
+end # Oga
diff --git a/spec/oga/xml/attribute_spec.rb b/spec/oga/xml/attribute_spec.rb
index 686e1bf..0afc4b5 100644
--- a/spec/oga/xml/attribute_spec.rb
+++ b/spec/oga/xml/attribute_spec.rb
@@ -33,7 +33,7 @@ describe Oga::XML::Attribute do
     end
 
     it 'returns the default XML namespace when the "xml" prefix is used' do
-      @default.namespace.should == Oga::XML::Attribute::DEFAULT_NAMESPACE
+      @default.namespace.should == Oga::XML::DEFAULT_NAMESPACE
     end
   end