diff --git a/src/core/nginx.h b/src/core/nginx.h
index 3649945..ddc1d95 100644
--- a/src/core/nginx.h
+++ b/src/core/nginx.h
@@ -11,7 +11,7 @@
 
 #define nginx_version      1013004
 #define NGINX_VERSION      "1.13.4"
-#define NGINX_VER          "nginx/" NGINX_VERSION
+#define NGINX_VER          "openresty/" NGINX_VERSION ".unknown"
 
 #ifdef NGX_BUILD
 #define NGINX_VER_BUILD    NGINX_VER " (" NGX_BUILD ")"
diff --git a/src/http/ngx_http_header_filter_module.c b/src/http/ngx_http_header_filter_module.c
index 9b89405..ca13f2a 100644
--- a/src/http/ngx_http_header_filter_module.c
+++ b/src/http/ngx_http_header_filter_module.c
@@ -46,7 +46,7 @@ ngx_module_t  ngx_http_header_filter_module = {
 };
 
 
-static u_char ngx_http_server_string[] = "Server: nginx" CRLF;
+static u_char ngx_http_server_string[] = "Server: openresty" CRLF;
 static u_char ngx_http_server_full_string[] = "Server: " NGINX_VER CRLF;
 static u_char ngx_http_server_build_string[] = "Server: " NGINX_VER_BUILD CRLF;
 
diff --git a/src/http/v2/ngx_http_v2_filter_module.c b/src/http/v2/ngx_http_v2_filter_module.c
index 8621e7a..a76c677 100644
--- a/src/http/v2/ngx_http_v2_filter_module.c
+++ b/src/http/v2/ngx_http_v2_filter_module.c
@@ -143,7 +143,7 @@ ngx_http_v2_header_filter(ngx_http_request_t *r)
     ngx_http_core_srv_conf_t  *cscf;
     u_char                     addr[NGX_SOCKADDR_STRLEN];
 
-    static const u_char nginx[5] = "\x84\xaa\x63\x55\xe7";
+    static const u_char nginx[8] = "\x87\x3d\x65\xaa\xc2\xa1\x3e\xbf";
 #if (NGX_HTTP_GZIP)
     static const u_char accept_encoding[12] =
         "\x8b\x84\x84\x2d\x69\x5b\x05\x44\x3c\x86\xaa\x6f";