diff --git a/include/haproxy/connection.h b/include/haproxy/connection.h
index 776a4cb51..72ba1796a 100644
--- a/include/haproxy/connection.h
+++ b/include/haproxy/connection.h
@@ -267,6 +267,14 @@ static inline void cs_close(struct conn_stream *cs)
 	cs->flags = CS_FL_NONE;
 }
 
+/* completely close a conn_stream after draining possibly pending data (but do not detach it) */
+static inline void cs_drain_and_close(struct conn_stream *cs)
+{
+	cs_shutw(cs, CS_SHW_SILENT);
+	cs_shutr(cs, CS_SHR_DRAIN);
+	cs->flags = CS_FL_NONE;
+}
+
 /* sets CS_FL_ERROR or CS_FL_ERR_PENDING on the cs */
 static inline void cs_set_error(struct conn_stream *cs)
 {