diff --git a/include/ViGEmBusShared.h b/include/ViGEmBusShared.h
index c618609..ff3b082 100644
--- a/include/ViGEmBusShared.h
+++ b/include/ViGEmBusShared.h
@@ -64,6 +64,7 @@ DEFINE_GUID(GUID_DEVINTERFACE_BUSENUM_VIGEM,
 #define IOCTL_DS4_REQUEST_NOTIFICATION  BUSENUM_W_IOCTL (IOCTL_VIGEM_BASE + 0x203)
 #define IOCTL_XGIP_SUBMIT_REPORT        BUSENUM_W_IOCTL (IOCTL_VIGEM_BASE + 0x204)
 #define IOCTL_XGIP_SUBMIT_INTERRUPT     BUSENUM_W_IOCTL (IOCTL_VIGEM_BASE + 0x205)
+#define IOCTL_XUSB_GET_USER_INDEX       BUSENUM_RW_IOCTL(IOCTL_VIGEM_BASE + 0x206)
 
 
 //