diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c
index 7430e5a39649..fc8b04f067f4 100644
--- a/sys/kern/kern_ktrace.c
+++ b/sys/kern/kern_ktrace.c
@@ -795,6 +795,7 @@ ktr_psig(int sig, sig_t action, const sigset_t *mask,
 	if (ktealloc(&kte, (void *)&kbuf, l, KTR_PSIG, sizeof(*kbuf)))
 		return;
 
+	memset(&kbuf->kp, 0, sizeof(kbuf->kp));
 	kbuf->kp.signo = (char)sig;
 	kbuf->kp.action = action;
 	kbuf->kp.mask = *mask;