2 files changed, 5 insertions, 1 deletions
diff --git a/lib/psych/ruby.rb b/lib/psych/ruby.rb
index 97734f5..896c185 100644
--- a/lib/psych/ruby.rb
+++ b/lib/psych/ruby.rb
@@ -1,4 +1,4 @@
-[Object, String].each do |klass|
+[Object, String, Class].each do |klass|
   klass.send(:remove_method, :to_yaml)
 end
 
diff --git a/lib/psych/visitors/yast_builder.rb b/lib/psych/visitors/yast_builder.rb
index 65ed594..df6d390 100644
--- a/lib/psych/visitors/yast_builder.rb
+++ b/lib/psych/visitors/yast_builder.rb
@@ -23,6 +23,10 @@ module Psych
       visitor_for(::String) do |o|
         @stack.last.children << Nodes::Scalar.new(o)
       end
+
+      visitor_for(::Class) do |o|
+        raise TypeError, "can't dump anonymous class #{o.class}"
+      end
     end
   end
 end