1 files changed, 2 insertions, 2 deletions

diff --git a/include/opkele/types.h b/include/opkele/types.h
index 1fab869..af7fb1a 100644
--- a/include/opkele/types.h
+++ b/include/opkele/types.h
@@ -140,6 +140,6 @@ namespace opkele {
             virtual fields_iterator fields_end() const = 0;
 
-            virtual string append_query(const string& url) const;
-            virtual string query_string() const;
+            virtual string append_query(const string& url,const char *pfx="openid.") const;
+            virtual string query_string(const char *pfx="openid.") const;