diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 32dcea662da3..fc821aa446f0 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -14,7 +14,7 @@
 
 struct root_name_map {
 	u64 id;
-	char name[16];
+	const char *name;
 };
 
 static const struct root_name_map root_map[] = {