diff --git a/lcd.c b/lcd.c
index 754073c..86d9c43 100644
--- a/lcd.c
+++ b/lcd.c
@@ -130,7 +130,7 @@ void lcd_close(struct lcddev *dev)
 
 static int lcd_open(struct lcddev *dev, const char *device)
 {
-	dev->fd = open(device, O_RDWR);
+	dev->fd = open(device, O_RDWR | O_NOCTTY | O_CLOEXEC);
 	if (dev->fd < 0) {
 		log_print(LOG_ERROR, "%s(): failed to open '%s'", __FUNCTION__, device);
 		return -1;
diff --git a/pic.c b/pic.c
index 074053d..9fb27aa 100644
--- a/pic.c
+++ b/pic.c
@@ -98,7 +98,7 @@ static int pic_close(struct picdev *dev)
 
 static int pic_open(struct picdev *dev, const char *device)
 {
-	dev->fd = open(device, O_RDWR);
+	dev->fd = open(device, O_RDWR | O_NOCTTY | O_CLOEXEC);
 	if (dev->fd < 0) {
 		log_print(LOG_ERROR, "%s(): failed to open '%s'", __FUNCTION__, device);
 		return -1;