diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index 7885d79f7515..3ee0678c0a83 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -665,7 +665,12 @@ struct btrfs_ioctl_get_dev_stats {
 	/* out values: */
 	__u64 values[BTRFS_DEV_STAT_VALUES_MAX];
 
-	__u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */
+	/*
+	 * This pads the struct to 1032 bytes. It was originally meant to pad to
+	 * 1024 bytes, but when adding the flags field, the padding calculation
+	 * was not adjusted.
+	 */
+	__u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX];
 };
 
 #define BTRFS_QUOTA_CTL_ENABLE	1