diff --git a/src/ngx_http_lua_kong_request_id.c b/src/ngx_http_lua_kong_request_id.c
index 6a524607..5c010456 100644
--- a/src/ngx_http_lua_kong_request_id.c
+++ b/src/ngx_http_lua_kong_request_id.c
@@ -18,46 +18,8 @@
 #include "ngx_http_lua_kong_common.h"
 
 
-#define KONG_REQUEST_ID_MAX_LEN     32
-#define KONG_REQUEST_ID_FORMAT      "%08x%08x%08x%08x"
-
-
-#if 0
-static void
-ngx_http_lua_kong_hex_string(uint32_t x, char *s)
-{
-    static const char digits[513] =
-        "000102030405060708090a0b0c0d0e0f"
-        "101112131415161718191a1b1c1d1e1f"
-        "202122232425262728292a2b2c2d2e2f"
-        "303132333435363738393a3b3c3d3e3f"
-        "404142434445464748494a4b4c4d4e4f"
-        "505152535455565758595a5b5c5d5e5f"
-        "606162636465666768696a6b6c6d6e6f"
-        "707172737475767778797a7b7c7d7e7f"
-        "808182838485868788898a8b8c8d8e8f"
-        "909192939495969798999a9b9c9d9e9f"
-        "a0a1a2a3a4a5a6a7a8a9aaabacadaeaf"
-        "b0b1b2b3b4b5b6b7b8b9babbbcbdbebf"
-        "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf"
-        "d0d1d2d3d4d5d6d7d8d9dadbdcdddedf"
-        "e0e1e2e3e4e5e6e7e8e9eaebecedeeef"
-        "f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff";
-
-    int i = 3;
-    while (i >= 0) {
-        int pos = (x & 0xFF) * 2;
-        char ch = digits[pos];
-        s[i * 2] = ch;
-
-        ch = digits[pos + 1];
-        s[i * 2 + 1] = ch;
-
-        x >>= 8;
-        i -= 1;
-    }
-}
-#endif
+#define KONG_REQUEST_ID_MAX_LEN     16
+#define KONG_REQUEST_ID_FORMAT      "%08x%08x"
 
 
 static ngx_int_t
@@ -79,7 +41,6 @@ ngx_http_lua_kong_variable_request_id(ngx_http_request_t *r,
     v->data = id;
 
     ngx_sprintf(id, KONG_REQUEST_ID_FORMAT,
-                (uint32_t) ngx_random(), (uint32_t) ngx_random(),
                 (uint32_t) ngx_random(), (uint32_t) ngx_random());
 
     return NGX_OK;