diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 0c93439e929f..815a5fc3ff9d 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -12,7 +12,7 @@
 
 struct root_name_map {
 	u64 id;
-	char name[16];
+	const char *name;
 };
 
 static const struct root_name_map root_map[] = {