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-rw-r--r--block/cow.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/cow.c b/block/cow.c
index a33ce950d4..4baf9042fe 100644
--- a/block/cow.c
+++ b/block/cow.c
@@ -73,7 +73,7 @@ static int cow_open(BlockDriverState *bs, int flags)
     }
 
     if (be32_to_cpu(cow_header.magic) != COW_MAGIC) {
-        ret = -EINVAL;
+        ret = -EMEDIUMTYPE;
         goto fail;
     }