diff --git a/http/handler.go b/http/handler.go
index ae02a44..ce8e38d 100644
--- a/http/handler.go
+++ b/http/handler.go
@@ -288,6 +288,7 @@ func (this *Handler) serveError (
 		this.serveError(res, req, http.StatusInternalServerError, err, true)
 		return
 	}
+	res.WriteHeader(status)
 	err = document.Execute(res, step.ExecutionData {
 		Data: Error {
 			Status:  status,