diff --git a/src/individualmailcomponentfactory.cpp b/src/individualmailcomponentfactory.cpp
--- a/src/individualmailcomponentfactory.cpp
+++ b/src/individualmailcomponentfactory.cpp
@@ -47,8 +47,15 @@
 
 void IndividualMessageQueueJob::start()
 {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+    const auto to = addressAttribute().to();
+    QSet<QString> attendeesTo(to.begin(), to.end());
+    const auto cc = addressAttribute().cc();
+    QSet<QString> attendeesCc(cc.begin(), cc.end());
+#else
     QSet<QString> attendeesTo(QSet<QString>::fromList(addressAttribute().to()));
     QSet<QString> attendeesCc(QSet<QString>::fromList(addressAttribute().cc()));
+#endif
 
     QStringList attendeesAutoTo, attendeesAutoCc;
     for (const KCalendarCore::Attendee &attendee : qAsConst(mUpdate)) {