diff --git a/libusb/os/windows_winusb.c b/libusb/os/windows_winusb.c
index ab49975..ffc1612 100644
--- a/libusb/os/windows_winusb.c
+++ b/libusb/os/windows_winusb.c
@@ -3245,7 +3245,13 @@
 			// iso only supported on libusbk-based backends for now
 			PKISO_CONTEXT iso_context = transfer_priv->iso_context;
 			for (i = 0; i < transfer->num_iso_packets; i++) {
-				transfer->iso_packet_desc[i].actual_length = iso_context->IsoPackets[i].actual_length;
+				if (IS_XFERIN(transfer)) {
+					transfer->iso_packet_desc[i].actual_length = iso_context->IsoPackets[i].actual_length;
+				} else {
+					// On Windows the usbd Length field is not used for OUT transfers.
+					// Copy the requested value back for consistency with other platforms.
+					transfer->iso_packet_desc[i].actual_length = transfer->iso_packet_desc[i].length;
+				}
 				// TODO translate USDB_STATUS codes http://msdn.microsoft.com/en-us/library/ff539136(VS.85).aspx to libusb_transfer_status
 				//transfer->iso_packet_desc[i].status = transfer_priv->iso_context->IsoPackets[i].status;
 			}
@@ -3266,6 +3272,9 @@
 			} else {
 				for (i = 0; i < transfer->num_iso_packets; i++) {
 					transfer->iso_packet_desc[i].status = LIBUSB_TRANSFER_COMPLETED;
+					// On Windows the usbd Length field is not used for OUT transfers.
+					// Copy the requested value back for consistency with other platforms.
+					transfer->iso_packet_desc[i].actual_length = transfer->iso_packet_desc[i].length;
 				}
 			}
 		} else {
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index ae65857..a04468b 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11719
+#define LIBUSB_NANO 11720