diff --git a/runtime/errors.go b/runtime/errors.go
index ec1c419339e..4401c49ac7e 100644
--- a/runtime/errors.go
+++ b/runtime/errors.go
@@ -38,7 +38,7 @@ func HTTPStatusFromCode(code codes.Code) int {
 	case codes.OK:
 		return http.StatusOK
 	case codes.Canceled:
-		return http.StatusRequestTimeout
+		return 499
 	case codes.Unknown:
 		return http.StatusInternalServerError
 	case codes.InvalidArgument: