diff --git a/src/device/macosdevicelister.mm b/src/device/macosdevicelister.mm
index 9f69a4d7c..df2e93f04 100644
--- a/src/device/macosdevicelister.mm
+++ b/src/device/macosdevicelister.mm
@@ -713,8 +713,7 @@ QList<QUrl> MacOsDeviceLister::MakeDeviceUrls(const QString& serial) {
 
   if (IsMTPSerial(serial)) {
     const MTPDevice& device = mtp_devices_[serial];
-    QString str;
-    str.sprintf("gphoto2://usb-%d-%d/", device.bus, device.address);
+    QString str = QString("gphoto2://usb-%d-%d/").arg(device.bus).arg(device.address);
     QUrlQuery url_query;
     url_query.addQueryItem("vendor", device.vendor);
     url_query.addQueryItem("vendor_id", QString::number(device.vendor_id));