diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c
index e4b4b5c76c94..a276e639f741 100644
--- a/sys/kern/kern_ktrace.c
+++ b/sys/kern/kern_ktrace.c
@@ -237,8 +237,8 @@ ktr_getrequest(int type)
 		mtx_unlock(&ktrace_mtx);
 		microtime(&req->ktr_header.ktr_time);
 		req->ktr_header.ktr_pid = p->p_pid;
+		req->ktr_header.ktr_tid = td->td_tid;
 		bcopy(p->p_comm, req->ktr_header.ktr_comm, MAXCOMLEN + 1);
-		req->ktr_header.ktr_unused = 0;
 		req->ktr_buffer = NULL;
 		req->ktr_header.ktr_len = 0;
 	} else {
diff --git a/sys/sys/ktrace.h b/sys/sys/ktrace.h
index eb0cfc781ea5..f4171c357bbe 100644
--- a/sys/sys/ktrace.h
+++ b/sys/sys/ktrace.h
@@ -54,7 +54,7 @@ struct ktr_header {
 	pid_t	ktr_pid;		/* process id */
 	char	ktr_comm[MAXCOMLEN+1];	/* command name */
 	struct	timeval ktr_time;	/* timestamp */
-	intptr_t	ktr_unused;	/* was ktr_buffer */
+	intptr_t	ktr_tid;	/* was ktr_buffer */
 };
 
 /*