diff --git a/sys/compat/linux/linux_ioctl.c b/sys/compat/linux/linux_ioctl.c
index 09c07207000c..824bcf053b5f 100644
--- a/sys/compat/linux/linux_ioctl.c
+++ b/sys/compat/linux/linux_ioctl.c
@@ -916,6 +916,8 @@ linux_ioctl_termio(struct thread *td, struct linux_ioctl_args *args)
 
 	case LINUX_TIOCGSERIAL: {
 		struct linux_serial_struct lss;
+
+		bzero(&lss, sizeof(lss));
 		lss.type = LINUX_PORT_16550A;
 		lss.flags = 0;
 		lss.close_delay = 0;
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
index bd3d6aa9d494..01fd25a56414 100644
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -149,6 +149,7 @@ linux_sysinfo(struct thread *td, struct linux_sysinfo_args *args)
 	int i, j;
 	struct timespec ts;
 
+	bzero(&sysinfo, sizeof(sysinfo));
 	getnanouptime(&ts);
 	if (ts.tv_nsec != 0)
 		ts.tv_sec++;
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 11813fca4146..f2416e065280 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -2068,6 +2068,7 @@ cvtstat(st, ost)
 	struct ostat *ost;
 {
 
+	bzero(ost, sizeof(*ost));
 	ost->st_dev = st->st_dev;
 	ost->st_ino = st->st_ino;
 	ost->st_mode = st->st_mode;