1 files changed, 2 insertions, 2 deletions
diff --git a/nest/attrs.h b/nest/attrs.h
index a17b8c05..6fb0a8fa 100644
--- a/nest/attrs.h
+++ b/nest/attrs.h
@@ -65,8 +65,8 @@ static inline struct adata *as_path_prepend(struct linpool *pool, const struct a
 struct f_path_mask_item {
   union {
     u32 asn; /* PM_ASN */
-    struct f_line *expr; /* PM_ASN_EXPR */
-    struct f_tree *set; /* PM_ASN_SET */
+    const struct f_line *expr; /* PM_ASN_EXPR */
+    const struct f_tree *set; /* PM_ASN_SET */
     struct { /* PM_ASN_RANGE */
       u32 from;
       u32 to;