diff --git a/adb/usb_osx.c b/adb/usb_osx.c
index 45ce4442e..5efb23bdf 100644
--- a/adb/usb_osx.c
+++ b/adb/usb_osx.c
@@ -197,7 +197,8 @@ AndroidInterfaceAdded(void *refCon, io_iterator_t iterator)
         kr = (*dev)->GetDeviceProduct(dev, &product);
         kr = (*dev)->GetLocationID(dev, &locationId);
         if (kr == 0) {
-            snprintf(devpathBuf, sizeof(devpathBuf), "usb:%lX", locationId);
+            snprintf(devpathBuf, sizeof(devpathBuf), "usb:%" PRIu32 "X",
+	             (unsigned int)locationId);
             devpath = devpathBuf;
         }
         kr = (*dev)->USBGetSerialNumberStringIndex(dev, &serialIndex);
diff --git a/fastboot/usb_osx.c b/fastboot/usb_osx.c
index 0f55e0d82..0b6c515b7 100644
--- a/fastboot/usb_osx.c
+++ b/fastboot/usb_osx.c
@@ -328,7 +328,8 @@ static int try_device(io_service_t device, usb_handle *handle) {
         ERR("GetLocationId");
         goto error;
     }
-    snprintf(handle->info.device_path, sizeof(handle->info.device_path), "usb:%lX", locationId);
+    snprintf(handle->info.device_path, sizeof(handle->info.device_path),
+             "usb:%" PRIu32 "X", (unsigned int)locationId);
 
     kr = (*dev)->USBGetSerialNumberStringIndex(dev, &serialIndex);