diff --git a/fastboot/usb_osx.cpp b/fastboot/usb_osx.cpp
index 7ae2aa5..45ae833 100644
--- a/fastboot/usb_osx.cpp
+++ b/fastboot/usb_osx.cpp
@@ -293,6 +293,13 @@
 
     // So, we have a device, finally. Grab its vitals.
 
+
+    kr = (*dev)->USBDeviceOpen(dev);
+    if (kr != 0) {
+        WARN("USBDeviceOpen");
+        goto out;
+    }
+
     kr = (*dev)->GetDeviceVendor(dev, &handle->info.dev_vendor);
     if (kr != 0) {
         ERR("GetDeviceVendor");
@@ -365,12 +372,16 @@
         goto error;
     }
 
+    out:
+
+    (*dev)->USBDeviceClose(dev);
     (*dev)->Release(dev);
     return 0;
 
     error:
 
     if (dev != NULL) {
+        (*dev)->USBDeviceClose(dev);
         (*dev)->Release(dev);
     }