diff --git a/radix/radix.h b/radix/radix.h
index 04b8d9d..505e59a 100644
--- a/radix/radix.h
+++ b/radix/radix.h
@@ -10,10 +10,10 @@
 #define RULE_NOT_FOUND -1
 
 struct routing_record {
-    unsigned long long   _ip;
-    unsigned short     _rule;
-    unsigned   _ip_end_bit:7;
-    unsigned   _rule_valid:1;
+    unsigned long     _ip[2];
+    unsigned short    _rule;
+    unsigned          _mask:7;
+    unsigned          _valid:1;
 };
 
 struct radix_node {
@@ -31,9 +31,9 @@ typedef struct radix_node*     radix_node_t;
 typedef struct radix_holder*   radix_holder_t;
 typedef struct routing_record* record_t;
 
-struct radix_holder* create_holder();
-struct radix_node* create_node(record_t record);
-static struct radix_node* clone_node(radix_node_t n);
+radix_holder_t create_holder();
+radix_node_t create_node(record_t record);
+static radix_node_t clone_node(radix_node_t n);
 static void split_node(struct radix_node* n, unsigned bit);
 
 int destory_holder(struct radix_holder*);