diff --git a/src/http_htx.c b/src/http_htx.c
index f8178ba..d29106a 100644
--- a/src/http_htx.c
+++ b/src/http_htx.c
@@ -388,6 +388,8 @@
 		goto fail;
 
 	sl = http_get_stline(htx);
+	ALREADY_CHECKED(sl); /* the stline exists because http_replace_stline() succeded */
+
 	sl->flags &= ~HTX_SL_F_NORMALIZED_URI;
 	if (!http_update_host(htx, sl, uri))
 		goto fail;