diff --git a/src/core/ngx_hash.h b/src/core/ngx_hash.h
index da8b7e0b2..543532452 100644
--- a/src/core/ngx_hash.h
+++ b/src/core/ngx_hash.h
@@ -78,18 +78,6 @@ typedef struct {
 } ngx_hash_keys_arrays_t;
 
 
-typedef struct {
-    void            **buckets;
-    ngx_uint_t        hash_size;
-
-    ngx_uint_t        max_size;
-    ngx_uint_t        bucket_limit;
-    size_t            bucket_size;
-    char             *name;
-    ngx_uint_t        min_buckets;
-} ngx_hash0_t;
-
-
 typedef struct {
     ngx_uint_t        hash;
     ngx_str_t         key;