diff --git a/src/mux_h1.c b/src/mux_h1.c
index adfe0e5..f50b9d8 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -2589,6 +2589,7 @@
 				h1_send(h1c);
 			if (b_data(&h1c->obuf) || (h1c->flags & H1C_F_ERR_PENDING)) {
 				h1_refresh_timeout(h1c);
+				HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
 				return t;
 			}
 		}