diff --git a/src/core/nginx.h b/src/core/nginx.h
index 37e257fc..fd49eff7 100644
--- a/src/core/nginx.h
+++ b/src/core/nginx.h
@@ -11,7 +11,7 @@
 
 #define nginx_version      1013003
 #define NGINX_VERSION      "1.13.3"
-#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 9b894059..ca13f2a3 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;