diff --git a/src/mux_h1.c b/src/mux_h1.c
index 1fc65039f..d1022e699 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -1830,7 +1830,7 @@ static size_t h1_process_output(struct h1c *h1c, struct buffer *buf, size_t coun
 			default:
 			  error:
 				/* Unexpected error during output processing */
-				chn_htx->flags |= HTX_FL_PARSING_ERROR;
+				chn_htx->flags |= HTX_FL_PROCESSING_ERROR;
 				h1s->flags |= errflag;
 				h1c->flags |= H1C_F_CS_ERROR;
 				break;