diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.5)
-set(PIM_VERSION "5.11.42")
+set(PIM_VERSION "5.11.43")
 
 project(KCalCore VERSION ${PIM_VERSION})
 
diff --git a/src/incidencebase.h b/src/incidencebase.h
--- a/src/incidencebase.h
+++ b/src/incidencebase.h
@@ -518,14 +518,13 @@
     void clearAttendees();
 
     /**
-     Delete single attendee from the incidence.
+       Set the attendees of this incidence.
+       This replaces all previously set attendees, unlike addAttendee.
 
-     The given attendee will be delete()d at the end of this call.
-
-     @param attendee The attendee to be removeComment
-     @param doUpdate If true the Observers are notified, if false they are not.
+       @param attendees A list of attendees.
+       @param doUpdate If true the Observers are notified, if false they are not.
     */
-    void deleteAttendee(const Attendee::Ptr &attendee, bool doUpdate = true);
+    void setAttendees(const Attendee::List &attendees, bool doUpdate = true);
 
     /**
       Returns a list of incidence attendees.
diff --git a/src/incidencebase.cpp b/src/incidencebase.cpp
--- a/src/incidencebase.cpp
+++ b/src/incidencebase.cpp
@@ -449,27 +449,6 @@
     }
 }
 
-void IncidenceBase::deleteAttendee(const Attendee::Ptr &a, bool doupdate)
-{
-    if (!a || mReadOnly) {
-        return;
-    }
-
-    int index = d->mAttendees.indexOf(a);
-    if (index >= 0) {
-        if (doupdate) {
-            update();
-        }
-
-        d->mAttendees.remove(index);
-
-        if (doupdate) {
-            d->mDirtyFields.insert(FieldAttendees);
-            updated();
-        }
-    }
-}
-
 Attendee::List IncidenceBase::attendees() const
 {
     return d->mAttendees;
@@ -480,6 +459,29 @@
     return d->mAttendees.count();
 }
 
+void IncidenceBase::setAttendees(const Attendee::List &attendees, bool doUpdate)
+{
+    if (mReadOnly) {
+        return;
+    }
+
+    if (doUpdate) {
+        update();
+    }
+
+    // don't simply assign, we need the logic in addAttendee here too
+    clearAttendees();
+    d->mAttendees.reserve(attendees.size());
+    for (const auto &a : attendees) {
+        addAttendee(a, false);
+    }
+
+    if (doUpdate) {
+        d->mDirtyFields.insert(FieldAttendees);
+        updated();
+    }
+}
+
 void IncidenceBase::clearAttendees()
 {
     if (mReadOnly) {