diff --git a/src/suisseid.hxx b/src/suisseid.hxx
index a3a1828..8a6aeff 100644
--- a/src/suisseid.hxx
+++ b/src/suisseid.hxx
@@ -284,7 +284,7 @@ namespace suisseid {
         for (cryptoki::ObjectList::iterator key(keys.begin());
              key!=keys.end(); ++key) {
           cryptoki::Attribute id(key->attribute(CKA_ID));
-          CRYPTOLOG("get certs for key with id "<<id);
+          CRYPTOLOG("get certs for key with id "<<id.value);
           cryptoki::ObjectList certs
             (session().find(cryptoki::AttributeList()
                             <<cryptoki::Attribute(CKA_CLASS)