diff --git a/spec/oga/xpath/evaluator/general_spec.rb b/spec/oga/xpath/evaluator/general_spec.rb
index b73f2d0..801432a 100644
--- a/spec/oga/xpath/evaluator/general_spec.rb
+++ b/spec/oga/xpath/evaluator/general_spec.rb
@@ -26,10 +26,10 @@ describe Oga::XPath::Evaluator do
 
   context '#node_matches?' do
     before do
-      ns = Oga::XML::Namespace.new(:name => 'x')
-
       @name_node    = Oga::XML::Element.new(:name => 'a')
-      @name_ns_node = Oga::XML::Element.new(:name => 'b', :namespace => ns)
+      @name_ns_node = Oga::XML::Element.new(:name => 'b', :namespace_name => 'x')
+
+      @name_ns_node.register_namespace('x', 'y')
     end
 
     example 'return true if a node is matched by its name' do
diff --git a/spec/oga/xpath/evaluator/paths_spec.rb b/spec/oga/xpath/evaluator/paths_spec.rb
index 1f5f92f..d239c3c 100644
--- a/spec/oga/xpath/evaluator/paths_spec.rb
+++ b/spec/oga/xpath/evaluator/paths_spec.rb
@@ -2,7 +2,7 @@ require 'spec_helper'
 
 describe Oga::XPath::Evaluator do
   before do
-    @document = parse('<a>Foo<b></b><b></b><ns1:c></ns1:c></a>')
+    @document = parse('<a xmlns:ns1="x">Foo<b></b><b></b><ns1:c></ns1:c></a>')
   end
 
   context 'absolute paths' do
diff --git a/spec/oga/xpath/evaluator/wildcard_spec.rb b/spec/oga/xpath/evaluator/wildcard_spec.rb
index c096156..c468f67 100644
--- a/spec/oga/xpath/evaluator/wildcard_spec.rb
+++ b/spec/oga/xpath/evaluator/wildcard_spec.rb
@@ -2,7 +2,7 @@ require 'spec_helper'
 
 describe Oga::XPath::Evaluator do
   before do
-    @document  = parse('<a><b></b><b></b><ns1:c></ns1:c></a>')
+    @document  = parse('<a xmlns:ns1="x"><b></b><b></b><ns1:c></ns1:c></a>')
     @evaluator = described_class.new(@document)
   end