diff --git a/device/win_usb/win_usb.cpp b/device/win_usb/win_usb.cpp
index 64bd069..1ca776e 100644
--- a/device/win_usb/win_usb.cpp
+++ b/device/win_usb/win_usb.cpp
@@ -757,13 +757,31 @@ int usb_device::transfer_control(uint8_t type, uint8_t req, uint16_t val, uint16
         irp.uLength = len;
         irp.uOffset = val;
         if (DeviceIoControl((HANDLE)handle_, IOCTL_SEND_USB_REQUEST, &irp, sizeof(irp), data, len, oc->io_bytes(), oc->over_lapped()))
-            ret = *oc->io_bytes();
+        {
+            if (irp.fTransferDirectionIn)
+            {
+                GetOverlappedResult((HANDLE)handle_, oc->over_lapped(), oc->io_bytes(), FALSE);
+                ret = *oc->io_bytes();
+            }
+            else
+            {
+                ret = len;
+            }
+        }
         else if (GetLastError() == ERROR_IO_PENDING)
         {
             ret = WaitForSingleObject(oc->over_lapped()->hEvent, timeout) == WAIT_TIMEOUT ? LIBUSB_ERROR_TIMEOUT : *oc->io_bytes();
         }
         else
-            ret = LIBUSB_ERROR_PIPE;
+        {
+            io = GetLastError();
+            if (io == ERROR_ACCESS_DENIED)
+                ret = LIBUSB_ERROR_ACCESS;
+            else if (io == ERROR_SEM_TIMEOUT)
+                ret = LIBUSB_ERROR_TIMEOUT;
+            else
+                ret = LIBUSB_ERROR_PIPE;
+        }
         oc->release();
     }