diff --git a/src/knot/conf/cf-parse.y b/src/knot/conf/cf-parse.y
index 67c0e4a1f92f122f620acc11de7af8b201c1f263..0e4f98cf219816b0230c3c5f39c6e7aa3afef2e9 100644
--- a/src/knot/conf/cf-parse.y
+++ b/src/knot/conf/cf-parse.y
@@ -592,6 +592,7 @@ keys:
 		      fqdn);
 	     free($4.t);
 	 } else {
+             knot_dname_to_lower(dname);
              conf_key_t *k = malloc(sizeof(conf_key_t));
              memset(k, 0, sizeof(conf_key_t));