diff --git a/chapter6/hello-verifier.bpf.c b/chapter6/hello-verifier.bpf.c
index 9bf45ec..b3c31a4 100644
--- a/chapter6/hello-verifier.bpf.c
+++ b/chapter6/hello-verifier.bpf.c
@@ -45,7 +45,7 @@ int kprobe_exec(void *ctx)
    }
 
    if (p != 0) {
-      bpf_probe_read_kernel(data.message, sizeof(data.message), p->message);  
+      bpf_probe_read_kernel_str(data.message, sizeof(data.message), p->message);  
    } else {
       bpf_probe_read_kernel_str(data.message, sizeof(data.message), message); 
    }
diff --git a/chapter7/hello.bpf.c b/chapter7/hello.bpf.c
index c0817f1..03d675d 100644
--- a/chapter7/hello.bpf.c
+++ b/chapter7/hello.bpf.c
@@ -76,7 +76,7 @@ int BPF_PROG(fentry_execve, struct filename *filename) {
 
    bpf_get_current_comm(data.command, sizeof(data.command));
    const char *name = BPF_CORE_READ(filename, name);
-   bpf_probe_read_kernel(data.path, sizeof(data.path), name);
+   bpf_probe_read_kernel_str(data.path, sizeof(data.path), name);
 
    bpf_printk("%s: filename->name: %s", fentry_msg, name);