diff --git a/examples/c-form/ex5.bpf.c b/examples/c-form/ex5.bpf.c
index 8eaa54c..11ce38b 100644
--- a/examples/c-form/ex5.bpf.c
+++ b/examples/c-form/ex5.bpf.c
@@ -1,3 +1,5 @@
+#define __TARGET_ARCH_arm64
+
 #include "vmlinux.h"
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
@@ -20,13 +22,4 @@ int BPF_KPROBE(trace_start, struct request *req)
     return 0;
 }
 
-// Optionally, attach also to blk_mq_start_request
-SEC("kprobe/blk_mq_start_request")
-int BPF_KPROBE(trace_start_mq, struct request *req)
-{
-    u64 ts = bpf_ktime_get_ns();
-    bpf_map_update_elem(&start, &req, &ts, BPF_ANY);
-    return 0;
-}
-
 char LICENSE[] SEC("license") = "GPL";