diff --git a/lib/format_text/text_label.c b/lib/format_text/text_label.c
index 468f593b7..1f8325f0f 100644
--- a/lib/format_text/text_label.c
+++ b/lib/format_text/text_label.c
@@ -660,7 +660,7 @@ static void _fmt_text_destroy(struct labeller *l)
 	free(l);
 }
 
-struct label_ops _text_ops = {
+const struct label_ops _text_ops = {
 	.can_handle = _text_can_handle,
 	.write = _text_write,
 	.read = _text_read,
diff --git a/lib/label/label.h b/lib/label/label.h
index 26784c3e8..be193f915 100644
--- a/lib/label/label.h
+++ b/lib/label/label.h
@@ -84,7 +84,7 @@ struct label_ops {
 };
 
 struct labeller {
-	struct label_ops *ops;
+	const struct label_ops *ops;
 	const struct format_type *fmt;
 };