diff --git a/src/mux_h1.c b/src/mux_h1.c
index f1788de3c..b715e76de 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -2296,6 +2296,7 @@ static size_t h1_make_eoh(struct h1s *h1s, struct h1m *h1m, struct htx *htx, siz
 		else if ((h1m->flags & (H1_MF_XFER_ENC|H1_MF_CLEN)) == (H1_MF_XFER_ENC|H1_MF_CLEN)) {
 			/* T-E + C-L: force close */
 			h1s->flags = (h1s->flags & ~H1S_F_WANT_MSK) | H1S_F_WANT_CLO;
+			h1m->flags &= ~H1_MF_CLEN;
 			TRACE_STATE("force close mode (T-E + C-L)", H1_EV_TX_DATA|H1_EV_TX_HDRS, h1s->h1c->conn, h1s);
 		}
 		else if ((h1m->flags & (H1_MF_VER_11|H1_MF_XFER_ENC)) == H1_MF_XFER_ENC) {