diff --git a/plan/src/plugins/filters/icalendar/export/icalendarexport.cpp b/plan/src/plugins/filters/icalendar/export/icalendarexport.cpp
--- a/plan/src/plugins/filters/icalendar/export/icalendarexport.cpp
+++ b/plan/src/plugins/filters/icalendar/export/icalendarexport.cpp
@@ -27,11 +27,19 @@
 #include <kptdocuments.h>
 #include "kptdebug.h"
 
+#if KCALCORE_VERSION >= QT_VERSION_CHECK(5, 12, 0)
+#include <kcalendarcore/attendee.h>
+#include <kcalendarcore/attachment.h>
+#include <kcalendarcore/icalformat.h>
+#include <kcalendarcore/memorycalendar.h>
+#include <kcalendarcore_version.h>
+#else
 #include <kcalcore/attendee.h>
 #include <kcalcore/attachment.h>
 #include <kcalcore/icalformat.h>
 #include <kcalcore/memorycalendar.h>
 #include <kcalcore_version.h>
+#endif
 
 #include <QTextCodec>
 #include <QByteArray>