diff --git a/src/core/ngx_hash.h b/src/core/ngx_hash.h
index ad73438..da8b7e0 100644
--- a/src/core/ngx_hash.h
+++ b/src/core/ngx_hash.h
@@ -94,6 +94,7 @@
     ngx_uint_t        hash;
     ngx_str_t         key;
     ngx_str_t         value;
+    u_char           *lowcase_key;
 } ngx_table_elt_t;
 
 
@@ -106,7 +107,7 @@
 ngx_int_t ngx_hash_wildcard_init(ngx_hash_init_t *hinit, ngx_hash_key_t *names,
     ngx_uint_t nelts);
 
-#define ngx_hash(key, c)   key * 31 + c
+#define ngx_hash(key, c)   ((ngx_uint_t) key * 31 + c)
 ngx_uint_t ngx_hash_key(u_char *data, size_t len);
 ngx_uint_t ngx_hash_key_lc(u_char *data, size_t len);
 
@@ -115,9 +116,4 @@
     void *value, ngx_uint_t flags);
 
 
-#define ngx_hash0(key, c)   key + c
-ngx_int_t ngx_hash0_init(ngx_hash0_t *hash, ngx_pool_t *pool, void *names,
-    ngx_uint_t nelts);
-
-
 #endif /* _NGX_HASH_H_INCLUDED_ */