diff --git a/src/mux_h1.c b/src/mux_h1.c
index 0b76ef4..ffec7e8 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -1692,7 +1692,7 @@
 				break;
 
 			default:
-				h1m->flags |= errflag;
+				h1s->flags |= errflag;
 				break;
 		}
 		total += vlen;