diff --git a/api/main.go b/api/main.go
index 51741d6..acd0f69 100644
--- a/api/main.go
+++ b/api/main.go
@@ -113,6 +113,7 @@ func Execute(res http.ResponseWriter, req *http.Request) {
 
     pres, _ := json.Marshal(problem)
 
+    res.WriteHeader(http.StatusBadRequest)
     res.Write(pres)
 }