diff --git a/src/mux_h2.c b/src/mux_h2.c
index adcd0b4..685d583 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -5150,7 +5150,8 @@
 			sw->events |= SUB_RETRY_SEND;
 			sw->handle = h2s;
 			h2s->send_wait = sw;
-			if (!(h2s->flags & H2_SF_BLK_SFCTL)) {
+			if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
+			    LIST_ISEMPTY(&h2s->list)) {
 				if (h2s->flags & H2_SF_BLK_MFCTL)
 					LIST_ADDQ(&h2c->fctl_list, &h2s->list);
 				else