diff --git a/src/libs/solutions/tasking/tasktree.h b/src/libs/solutions/tasking/tasktree.h
index 29409a448b4..df26596d027 100644
--- a/src/libs/solutions/tasking/tasktree.h
+++ b/src/libs/solutions/tasking/tasktree.h
@@ -33,6 +33,9 @@ private:
     template <typename Task> friend class TaskAdapter;
     friend class TaskNode;
     TaskInterface() = default;
+#ifdef Q_QDOC
+protected:
+#endif
     virtual void start() = 0;
 };