diff --git a/internal/ghl/admin.go b/internal/ghl/admin.go
index ce385bb..22f17a4 100644
--- a/internal/ghl/admin.go
+++ b/internal/ghl/admin.go
@@ -167,12 +167,9 @@ func (h *AdminHandler) HandleSetLocationConfig(w http.ResponseWriter, r *http.Re
 }
 
 func writeJSON(w http.ResponseWriter, status int, v any) {
-	data, err := json.Marshal(v)
-	if err != nil {
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return
-	}
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(status)
-	_, _ = w.Write(data)
+	if err := json.NewEncoder(w).Encode(v); err != nil {
+		slog.Error("admin: failed to encode response", "err", err)
+	}
 }