diff --git a/src/subnet.h b/src/subnet.h
index ff5ba36f..9f06814a 100644
--- a/src/subnet.h
+++ b/src/subnet.h
@@ -67,10 +67,6 @@ typedef struct subnet_t {
 #define MAXNETSTR 64
 
 extern splay_tree_t *subnet_tree;
-extern hash_t *ipv4_cache;
-extern hash_t *ipv6_cache;
-extern hash_t *mac_cache;
-
 extern int subnet_compare(const struct subnet_t *, const struct subnet_t *);
 extern subnet_t *new_subnet(void) __attribute__ ((__malloc__));
 extern void free_subnet(subnet_t *);