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diff --git a/libusb/os/darwin_usb.c b/libusb/os/darwin_usb.c
index b0ee5b2..fe40899 100644
--- a/libusb/os/darwin_usb.c
+++ b/libusb/os/darwin_usb.c
@@ -1449,8 +1449,14 @@ static int submit_bulk_transfer(struct usbi_transfer *itransfer) {
cInterface = &priv->interfaces[iface];
- (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number,
- &transferType, &maxPacketSize, &interval);
+ ret = (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number,
+ &transferType, &maxPacketSize, &interval);
+
+ if (ret) {
+ usbi_err (TRANSFER_CTX (transfer), "bulk transfer failed (dir = %s): %s (code = 0x%08x)", IS_XFERIN(transfer) ? "In" : "Out",
+ darwin_error_str(ret), ret);
+ return darwin_to_libusb (ret);
+ }
if (0 != (transfer->length % maxPacketSize)) {
/* do not need a zero packet */
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