diff --git a/internal/restic/tree.go b/internal/restic/tree.go
index d62354b3a..373b36746 100644
--- a/internal/restic/tree.go
+++ b/internal/restic/tree.go
@@ -145,7 +145,7 @@ func SaveTree(ctx context.Context, r BlobSaver, t *Tree) (ID, error) {
 	return id, err
 }
 
-var ErrTreeNotOrdered = errors.Errorf("nodes are not ordered or duplicate")
+var ErrTreeNotOrdered = errors.New("nodes are not ordered or duplicate")
 
 type TreeJSONBuilder struct {
 	buf      bytes.Buffer