diff --git a/block.h b/block.h
index 4e99e1816eb69f654c03e423270a6fa5fc121a1e..5151deab48b537beecd2728cdc2f25ea82029b84 100644
--- a/block.h
+++ b/block.h
@@ -78,6 +78,7 @@ typedef struct BlockDevOps {
 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
+#define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
 
 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)