diff --git a/drivers/ioexpander/gpio.c b/drivers/ioexpander/gpio.c
index 9c2d46cc20..9e806c3bee 100644
--- a/drivers/ioexpander/gpio.c
+++ b/drivers/ioexpander/gpio.c
@@ -99,7 +99,7 @@ static const struct file_operations g_gpio_drvrops =
 static int gpio_handler(FAR struct gpio_dev_s *dev)
 {
   DEBUGASSERT(dev != NULL);
-  kill(dev->gp_pid, dev->gp_signo);
+  (void)kill(dev->gp_pid, dev->gp_signo);
   return OK;
 }