diff --git a/include/block/block.h b/include/block/block.h
index 23c76421e4..19184d5850 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -114,6 +114,7 @@ typedef struct HDGeometry {
                                       ignoring the format layer */
 #define BDRV_O_NO_IO       0x10000 /* don't initialize for I/O */
 #define BDRV_O_AUTO_RDONLY 0x20000 /* degrade to read-only if opening read-write fails */
+#define BDRV_O_IO_URING    0x40000 /* use io_uring instead of the thread pool */
 
 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)