diff --git a/include/haproxy/task.h b/include/haproxy/task.h
index c5c0c1eb6..df4b42ea5 100644
--- a/include/haproxy/task.h
+++ b/include/haproxy/task.h
@@ -262,6 +262,13 @@ static inline int __task_set_state_and_tid(struct task *t, int expected_tid, int
 #endif
 }
 
+static inline int __task_get_new_tid_field(int curtid)
+{
+	if (curtid >= 0 || curtid < -1)
+		return curtid;
+	return -2 - tid;
+}
+
 /* puts the task <t> in run queue with reason flags <f>, and returns <t> */
 /* This will put the task in the local runqueue if the task is only runnable
  * by the current thread, in the global runqueue otherwies. With DEBUG_TASK,