diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 74d8913..2b7dd88 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -510,7 +510,7 @@
 		em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
 		unlock_extent(io_tree, start, start + len - 1, GFP_NOFS);
 
-		if (!em)
+		if (IS_ERR(em))
 			return 0;
 	}