diff --git a/src/sys/driver.h b/src/sys/driver.h
index fe748534..cebb48bf 100644
--- a/src/sys/driver.h
+++ b/src/sys/driver.h
@@ -1182,7 +1182,6 @@ typedef struct
     KSPIN_LOCK SpinLock;
     LONG RefCount;
     UINT32 Kind;
-    GUID SiloContainerId;
     /* IoTimer emulation */
     FSP_DEVICE_TIMER DeviceTimer;
 } FSP_DEVICE_EXTENSION;