1 files changed, 1 insertions, 1 deletions
diff --git a/filter/data.h b/filter/data.h
index dd9830df..4ebce73b 100644
--- a/filter/data.h
+++ b/filter/data.h
@@ -72,7 +72,7 @@ struct f_val {
     lcomm lc;
     ip_addr ip;
     const net_addr *net;
-    char *s;
+    const char *s;
     const struct f_tree *t;
     const struct f_trie *ti;
     const struct adata *ad;