diff --git a/convert/source-ext2.c b/convert/source-ext2.c
index 5efaaa4b..becfd377 100644
--- a/convert/source-ext2.c
+++ b/convert/source-ext2.c
@@ -639,7 +639,7 @@ static int ext2_copy_single_xattr(struct btrfs_trans_handle *trans,
 		data = databuf;
 		datalen = bufsize;
 	}
-	strncpy_null(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
+	strncpy_null(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX + 1);
 	strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
 	if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root->fs_info) -
 	    sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {