diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c
index c2f747c474d..f7cbff098c5 100644
--- a/sys/kern/kern_ktrace.c
+++ b/sys/kern/kern_ktrace.c
@@ -112,7 +112,7 @@ struct ktr_request {
 	STAILQ_ENTRY(ktr_request) ktr_list;
 };
 
-static int data_lengths[] = {
+static const int data_lengths[] = {
 	[KTR_SYSCALL] = offsetof(struct ktr_syscall, ktr_args),
 	[KTR_SYSRET] = sizeof(struct ktr_sysret),
 	[KTR_NAMEI] = 0,