diff --git a/src/util/externalcommand.cpp b/src/util/externalcommand.cpp
--- a/src/util/externalcommand.cpp
+++ b/src/util/externalcommand.cpp
@@ -450,15 +450,15 @@
         QDBusPendingCall pcall = iface.asyncCall(QStringLiteral("getNonce"));
         QDBusPendingCallWatcher *watcher = new QDBusPendingCallWatcher(pcall);
         QEventLoop loop;
-        unsigned long long rval = 0;
+        quint64 rval = 0;
 
         auto exitLoop = [&] (QDBusPendingCallWatcher *watcher) {
             loop.exit();
 
             if (watcher->isError())
                 qWarning() << watcher->error();
             else {
-                QDBusPendingReply<unsigned long long> reply = *watcher;
+                QDBusPendingReply<quint64> reply = *watcher;
                 rval = reply;
             }
         };