diff --git a/messagecomposer/src/followupreminder/followupreminderselectdatedialog.h b/messagecomposer/src/followupreminder/followupreminderselectdatedialog.h
--- a/messagecomposer/src/followupreminder/followupreminderselectdatedialog.h
+++ b/messagecomposer/src/followupreminder/followupreminderselectdatedialog.h
@@ -24,6 +24,7 @@
 #include <QPushButton>
 #include <AkonadiCore/Collection>
 #include "messagecomposer_export.h"
+#include <memory>
 class QAbstractItemModel;
 
 namespace MessageComposer {