diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index 56d49a3..cfbfb8c 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -2292,7 +2292,7 @@
 	return 1;
 
   error:
-	err = &http_err_chunks[HTTP_ERR_400];
+	err = &htx_err_chunks[HTTP_ERR_400];
 	channel_erase(res);
 	res->buf.data = b_data(err);
 	memcpy(res->buf.area, b_head(err), b_data(err));