diff --git a/src/41-xdp-tcpdump/xdp-tcpdump.h b/src/41-xdp-tcpdump/xdp-tcpdump.h
index 71c1d66..a7e1630 100644
--- a/src/41-xdp-tcpdump/xdp-tcpdump.h
+++ b/src/41-xdp-tcpdump/xdp-tcpdump.h
@@ -1,5 +1,5 @@
-#ifndef __XDP_TCPDUMP_H
-#define __XDP_TCPDUMP_H
+#ifndef XDP_TCPDUMP_H_
+#define XDP_TCPDUMP_H_
 
 #define MAX_TCP_HEADER_BYTES 60
 
@@ -8,4 +8,4 @@ struct tcp_event {
     unsigned char header[MAX_TCP_HEADER_BYTES];
 };
 
-#endif /* __XDP_TCPDUMP_H */
+#endif /* XDP_TCPDUMP_H_ */
diff --git a/src/42-xdp-loadbalancer/README.md b/src/42-xdp-loadbalancer/README.md
index 9709b4d..16efc11 100644
--- a/src/42-xdp-loadbalancer/README.md
+++ b/src/42-xdp-loadbalancer/README.md
@@ -450,7 +450,7 @@ To run the XDP load balancer, execute the following command, specifying the inte
 To make XDP work with veth interfaces we need to add a stub eBPF program to the other end of the pair.
 
 ```console
-clang -target bpf -I/usr/include/$(uname -m)-linux-gnu -o stub.bpf.o -c stub.bpf.c
+clang -target bpf -I/usr/include/$(gcc -print-multiarch) -o stub.bpf.o -c stub.bpf.c
 sudo ip l set dev veth7 xdp obj ./stub.bpf.o sec .xdp # stub XDP_PASS on the receiving interface
 sudo ip netns exec lb ./xdp_lb veth6 10.0.0.2 de:ad:be:ef:00:02 10.0.0.3 de:ad:be:ef:00:03
 ```
diff --git a/src/42-xdp-loadbalancer/README.zh.md b/src/42-xdp-loadbalancer/README.zh.md
index 096d3da..67f84be 100644
--- a/src/42-xdp-loadbalancer/README.zh.md
+++ b/src/42-xdp-loadbalancer/README.zh.md
@@ -449,7 +449,7 @@ sudo ./teardown.sh
 要运行 XDP 负载均衡器，执行以下命令，指定接口和后端服务器的 IP 和 MAC 地址。为了让 XDP 在 veth 接口上工作，还需要在 veth 对的另一端挂载一个返回 `XDP_PASS` 的桩程序。
 
 ```console
-clang -target bpf -I/usr/include/$(uname -m)-linux-gnu -o stub.bpf.o -c stub.bpf.c
+clang -target bpf -I/usr/include/$(gcc -print-multiarch) -o stub.bpf.o -c stub.bpf.c
 sudo ip l set dev veth7 xdp obj ./stub.bpf.o sec .xdp
 sudo ip netns exec lb ./xdp_lb veth6 10.0.0.2 de:ad:be:ef:00:02 10.0.0.3 de:ad:be:ef:00:03
 ```