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-rw-r--r--block/qcow2.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2.h b/block/qcow2.h
index ecc94cbfad..26ab5d9523 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -47,7 +47,7 @@
#define REFCOUNT_SHIFT 1 /* refcount size is 2 bytes */
#define MIN_CLUSTER_BITS 9
-#define MAX_CLUSTER_BITS 16
+#define MAX_CLUSTER_BITS 21
#define L2_CACHE_SIZE 16