1 files changed, 1 insertions, 0 deletions
diff --git a/block_int.h b/block_int.h
index e83fd2c077..781789c9e1 100644
--- a/block_int.h
+++ b/block_int.h
@@ -127,6 +127,7 @@ struct BlockDriverState {
     int type;
     char device_name[32];
     BlockDriverState *next;
+    void *private;
 };
 
 struct BlockDriverAIOCB {