diff --git a/src/stream_interface.c b/src/stream_interface.c
index 90e4044fb..905612cef 100644
--- a/src/stream_interface.c
+++ b/src/stream_interface.c
@@ -807,6 +807,14 @@ static void stream_int_chk_snd_conn(struct stream_interface *si)
 	    !(si->flags & SI_FL_WAIT_DATA))       /* not waiting for data */
 		return;
 
+	if (si->conn->flags & (CO_FL_DATA_WR_ENA|CO_FL_CURR_WR_ENA)) {
+		/* already subscribed to write notifications, will be called
+		 * anyway, so let's avoid calling it especially if the reader
+		 * is not ready.
+		 */
+		return;
+	}
+
 	if (!(si->conn->flags & (CO_FL_HANDSHAKE|CO_FL_WAIT_L4_CONN|CO_FL_WAIT_L6_CONN))) {
 		/* Before calling the data-level operations, we have to prepare
 		 * the polling flags to ensure we properly detect changes.