diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index bd4767f562cd..d18fccd45d0f 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3489,6 +3489,8 @@ static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,
 			const u64 sz = BTRFS_I(src)->root->fs_info->sectorsize;
 
 			len = round_down(i_size_read(src), sz) - loff;
+			if (len == 0)
+				return 0;
 			olen = len;
 		}
 	}