diff --git a/config.h b/config.h
index d5c4399..c47fc88 100644
--- a/config.h
+++ b/config.h
@@ -23,7 +23,6 @@
 
 #define DEFAULT_IPV4_LOCAL_SUBNET "192.0.0.4"
 #define DEFAULT_IPV4_LOCAL_PREFIXLEN "29"
-#define DNS64_DETECTION_HOSTNAME "ipv4only.arpa"
 
 struct clat_config {
   struct in6_addr ipv6_local_subnet;
@@ -37,8 +36,7 @@
 
 extern struct clat_config Global_Clatd_Config;
 
-int read_config(const char *file, const char *uplink_interface, const char *plat_prefix,
-                unsigned net_id);
+int read_config(const char *file, const char *uplink_interface);
 void config_generate_local_ipv6_subnet(struct in6_addr *interface_ip);
 in_addr_t config_select_ipv4_address(const struct in_addr *ip, int16_t prefixlen);
 int ipv6_prefix_equal(struct in6_addr *a1, struct in6_addr *a2);