diff --git a/include/proto/stream_interface.h b/include/proto/stream_interface.h
index 4d5abcf..584abcf 100644
--- a/include/proto/stream_interface.h
+++ b/include/proto/stream_interface.h
@@ -73,6 +73,15 @@
 		return LIST_ELEM(si, struct session *, si[0]);
 }
 
+/* returns the task associated to this stream interface */
+static inline struct task *si_task(struct stream_interface *si)
+{
+	if (si->flags & SI_FL_ISBACK)
+		return LIST_ELEM(si, struct session *, si[1])->task;
+	else
+		return LIST_ELEM(si, struct session *, si[0])->task;
+}
+
 /* Initializes all required fields for a new appctx. Note that it does the
  * minimum acceptable initialization for an appctx. This means only the
  * 3 integer states st0, st1, st2 are zeroed.