diff --git a/Externals/libusb/libusb/os/windows_winusb.c b/Externals/libusb/libusb/os/windows_winusb.c
index c7aec1f83a..19b605a6d5 100644
--- a/Externals/libusb/libusb/os/windows_winusb.c
+++ b/Externals/libusb/libusb/os/windows_winusb.c
@@ -2246,6 +2246,12 @@ static int winusbx_configure_endpoints(int sub_api, struct libusb_device_handle
 		if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
 			AUTO_CLEAR_STALL, sizeof(UCHAR), &policy))
 			usbi_dbg("failed to enable AUTO_CLEAR_STALL for endpoint %02X", endpoint_address);
+
+		if (sub_api == SUB_API_LIBUSBK) {
+			if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
+				ISO_ALWAYS_START_ASAP, sizeof(UCHAR), &policy))
+				usbi_dbg("failed to enable ISO_ALWAYS_START_ASAP for endpoint %02X", endpoint_address);
+		}
 	}
 
 	return LIBUSB_SUCCESS;
diff --git a/Externals/libusb/libusb/os/windows_winusb.h b/Externals/libusb/libusb/os/windows_winusb.h
index 651d7c4280..3a911d55f1 100644
--- a/Externals/libusb/libusb/os/windows_winusb.h
+++ b/Externals/libusb/libusb/os/windows_winusb.h
@@ -412,6 +412,7 @@ typedef struct _USB_NODE_CONNECTION_INFORMATION_EX_V2 {
 
 /* winusb.dll interface */
 
+/* pipe policies */
 #define SHORT_PACKET_TERMINATE	0x01
 #define AUTO_CLEAR_STALL	0x02
 #define PIPE_TRANSFER_TIMEOUT	0x03
@@ -420,6 +421,8 @@ typedef struct _USB_NODE_CONNECTION_INFORMATION_EX_V2 {
 #define AUTO_FLUSH		0x06
 #define RAW_IO			0x07
 #define MAXIMUM_TRANSFER_SIZE	0x08
+/* libusbK */
+#define ISO_ALWAYS_START_ASAP	0x21
 
 typedef enum _USBD_PIPE_TYPE {
 	UsbdPipeTypeControl,