diff --git a/src/log.c b/src/log.c
index 0aa043f..78f1a9e 100644
--- a/src/log.c
+++ b/src/log.c
@@ -310,6 +310,8 @@
 		return "spoe-message";
 	case ARGC_UBK:
 		return "use_backend";
+	case ARGC_HERR:
+		return "http-error";
 	default:
 		return "undefined(please report this bug)"; /* must never happen */
 	}