diff --git a/chap-34/http_server01.c b/chap-34/http_server01.c
index 535b867..0619daf 100644
--- a/chap-34/http_server01.c
+++ b/chap-34/http_server01.c
@@ -2,6 +2,8 @@
 #include <lib/http_server.h>
 #include "lib/common.h"
 #include "lib/event_loop.h"
+#include <string.h>
+#define _GNU_SOURCE
 
 //数据读到buffer之后的callback
 int onRequest(struct http_request *httpRequest, struct http_response *httpResponse) {
diff --git a/chap-34/http_server_test.c b/chap-34/http_server_test.c
index 45b37f3..d83e3b1 100644
--- a/chap-34/http_server_test.c
+++ b/chap-34/http_server_test.c
@@ -1,6 +1,8 @@
 #include "lib/http_request.h"
 #include "lib/http_server.h"
 #include "lib/http_response.h"
+#include <string.h>
+#define _GNU_SOURCE
 
 char *data = "GET / HTTP/1.1\r\nHost: localhost:43211\r\nUser-Agent: curl/7.54.0\r\nAccept: */*\r\n\r\n";
 
diff --git a/lib/buffer.c b/lib/buffer.c
index 5acd32e..3f1a0cf 100644
--- a/lib/buffer.c
+++ b/lib/buffer.c
@@ -1,5 +1,7 @@
 #include "buffer.h"
 #include "common.h"
+#include <string.h>
+#define _GNU_SOURCE
 
 const char *CRLF = "\r\n";
 
diff --git a/lib/http_server.c b/lib/http_server.c
index cba0507..c92d5f6 100644
--- a/lib/http_server.c
+++ b/lib/http_server.c
@@ -1,5 +1,7 @@
 #include <assert.h>
 #include "http_server.h"
+#include <string.h>
+#define _GNU_SOURCE
 
 
 //连接建立之后的callback