diff --git a/src/41-xdp-tcpdump/xdp-tcpdump.bpf.c b/src/41-xdp-tcpdump/xdp-tcpdump.bpf.c
index edebbfc..7a72d47 100644
--- a/src/41-xdp-tcpdump/xdp-tcpdump.bpf.c
+++ b/src/41-xdp-tcpdump/xdp-tcpdump.bpf.c
@@ -107,7 +107,7 @@ int xdp_pass(struct xdp_md *ctx)
     bpf_ringbuf_submit(event, 0);
 
     // Optional: Print a debug message (will appear in kernel logs)
-    bpf_printk("Captured TCP header (%d bytes)", tcp_header_bytes);
+    bpf_printk("Captured TCP header (%u bytes)", tcp_header_bytes);
 
     return XDP_PASS;
 }