diff --git a/lib/oga/xpath/compiler.rb b/lib/oga/xpath/compiler.rb
index f30f181..1872b0e 100644
--- a/lib/oga/xpath/compiler.rb
+++ b/lib/oga/xpath/compiler.rb
@@ -30,11 +30,16 @@ module Oga
           end
         end
 
-        literal('lambda').add_block(document) do
+        proc_ast = literal('lambda').add_block(document) do
           matched.assign(literal(XML::NodeSet).new)
             .followed_by(ruby_ast)
             .followed_by(matched)
         end
+
+        generator = Ruby::Generator.new
+        source    = generator.process(proc_ast)
+
+        eval(source)
       end
 
       ##
diff --git a/spec/oga/xpath/compiler_spec.rb b/spec/oga/xpath/compiler_spec.rb
index 18b8a22..3e4f372 100644
--- a/spec/oga/xpath/compiler_spec.rb
+++ b/spec/oga/xpath/compiler_spec.rb
@@ -31,7 +31,7 @@ describe Oga::XPath::Compiler do
         ast   = parse_xpath('foo')
         block = @compiler.compile(ast)
 
-        block.call(doc).should be_an_instance_of(NodeSet)
+        block.call(doc).should be_an_instance_of(Oga::XML::NodeSet)
       end
     end
   end