diff --git a/src/log.c b/src/log.c
index ba3399ad3..97f06f9ce 100644
--- a/src/log.c
+++ b/src/log.c
@@ -1112,6 +1112,14 @@ int lf_expr_postcheck(struct lf_expr *lf_expr, struct proxy *px, char **err)
 			px->to_log |= LW_XPRT;
 			if (px->http_needed)
 				px->to_log |= LW_REQ;
+
+			/* anything involving the response needs to happen at response time */
+			if (expr->fetch->use & (SMP_USE_HRSHP|SMP_USE_HRSHP|SMP_USE_HRSBO))
+				px->to_log |= LW_RESP;
+
+			/* anything involving the end of the response needs to happen after final bytes */
+			if (expr->fetch->use & (SMP_USE_HRSBO|SMP_USE_RQFIN|SMP_USE_RSFIN|SMP_USE_TXFIN|SMP_USE_SSFIN))
+				px->to_log |= LW_BYTES;
 		}
 		else if (lf->type == LOG_FMT_ALIAS) {
 			if (!default_px && !http_mode &&