diff --git a/doc/examples/suisse-id-demo.cxx b/doc/examples/suisse-id-demo.cxx
index aefa87a..22af2bb 100644
--- a/doc/examples/suisse-id-demo.cxx
+++ b/doc/examples/suisse-id-demo.cxx
@@ -10,6 +10,11 @@
 
 #include <QtNetwork/QSslCertificate>
 #include <QtCore/QDateTime>
+#include <QtCore/QStringList>
+
+void show(const QString& s, const std::string& p="item: ") {
+  std::cout<<p<<QString(s.toUtf8()).toStdString()<<std::endl;
+}
 
 void show(const QStringList& sl, const std::string& p="item: ") {
   for (QStringList::const_iterator s(sl.begin()); s!=sl.end(); ++s)