diff --git a/examples/shipping/booking/transport.go b/examples/shipping/booking/transport.go
index 1134713..9999e17 100644
--- a/examples/shipping/booking/transport.go
+++ b/examples/shipping/booking/transport.go
@@ -194,6 +194,7 @@
 	default:
 		w.WriteHeader(http.StatusInternalServerError)
 	}
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	json.NewEncoder(w).Encode(map[string]interface{}{
 		"error": err.Error(),
 	})
diff --git a/examples/shipping/handling/transport.go b/examples/shipping/handling/transport.go
index 806094d..ff9ece9 100644
--- a/examples/shipping/handling/transport.go
+++ b/examples/shipping/handling/transport.go
@@ -93,6 +93,7 @@
 	default:
 		w.WriteHeader(http.StatusInternalServerError)
 	}
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	json.NewEncoder(w).Encode(map[string]interface{}{
 		"error": err.Error(),
 	})