1 files changed, 1 insertions, 0 deletions
diff --git a/block_int.h b/block_int.h
index 0e5a032e77..0acb49f100 100644
--- a/block_int.h
+++ b/block_int.h
@@ -50,6 +50,7 @@
 #define BLOCK_OPT_TABLE_SIZE    "table_size"
 #define BLOCK_OPT_PREALLOC      "preallocation"
 #define BLOCK_OPT_SUBFMT        "subformat"
+#define BLOCK_OPT_COMPAT_LEVEL  "compat"
 
 typedef struct BdrvTrackedRequest BdrvTrackedRequest;