diff --git a/lib/casserver/authenticators/base.rb b/lib/casserver/authenticators/base.rb
index 240a68e..ca45242 100644
--- a/lib/casserver/authenticators/base.rb
+++ b/lib/casserver/authenticators/base.rb
@@ -38,7 +38,7 @@ module CASServer
       end
 
       def extra_attributes
-        @extra_attributes
+        @extra_attributes.stringify_keys
       end
 
       protected
diff --git a/lib/casserver/server.rb b/lib/casserver/server.rb
index 7a3f4c9..77f7633 100644
--- a/lib/casserver/server.rb
+++ b/lib/casserver/server.rb
@@ -785,4 +785,4 @@ module CASServer
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/spec/casserver/authenticators/ldap_spec.rb b/spec/casserver/authenticators/ldap_spec.rb
index 9b61252..3a87720 100644
--- a/spec/casserver/authenticators/ldap_spec.rb
+++ b/spec/casserver/authenticators/ldap_spec.rb
@@ -50,7 +50,7 @@ describe "CASServer::Authenticators::LDAP" do
         :request => {}
       ).should == true
 
-      auth.extra_attributes.should == {:full_name => 'Test', :address => 'Test'}
+      auth.extra_attributes.should == {"full_name" => 'Test', "address" => 'Test'}
     end
 
   end