diff --git a/checker/server.go b/checker/server.go
index 1036e99..6065fbd 100644
--- a/checker/server.go
+++ b/checker/server.go
@@ -114,7 +114,7 @@ func (s *Server) handleCollect(w http.ResponseWriter, r *http.Request) {
 
 	data, err := s.provider.Collect(r.Context(), req.Options)
 	if err != nil {
-		writeJSON(w, http.StatusOK, ExternalCollectResponse{
+		writeJSON(w, http.StatusInternalServerError, ExternalCollectResponse{
 			Error: err.Error(),
 		})
 		return
@@ -122,7 +122,7 @@ func (s *Server) handleCollect(w http.ResponseWriter, r *http.Request) {
 
 	raw, err := json.Marshal(data)
 	if err != nil {
-		writeJSON(w, http.StatusOK, ExternalCollectResponse{
+		writeJSON(w, http.StatusInternalServerError, ExternalCollectResponse{
 			Error: fmt.Sprintf("failed to marshal result: %v", err),
 		})
 		return
diff --git a/checker/server_test.go b/checker/server_test.go
index 5802532..3bc36bd 100644
--- a/checker/server_test.go
+++ b/checker/server_test.go
@@ -143,8 +143,8 @@ func TestServer_Collect_ProviderError(t *testing.T) {
 	}
 	srv := newTestServer(p)
 	rec := doRequest(srv.Handler(), "POST", "/collect", ExternalCollectRequest{Key: "test"}, nil)
-	if rec.Code != http.StatusOK {
-		t.Fatalf("POST /collect = %d, want %d", rec.Code, http.StatusOK)
+	if rec.Code != http.StatusInternalServerError {
+		t.Fatalf("POST /collect = %d, want %d", rec.Code, http.StatusInternalServerError)
 	}
 	var resp ExternalCollectResponse
 	json.NewDecoder(rec.Body).Decode(&resp)