diff --git a/samples/shields/npm6001_ek/src/main.c b/samples/shields/npm6001_ek/src/main.c
index e15f6a7..45db22d 100644
--- a/samples/shields/npm6001_ek/src/main.c
+++ b/samples/shields/npm6001_ek/src/main.c
@@ -9,6 +9,7 @@
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/drivers/watchdog.h>
 #include <zephyr/dt-bindings/gpio/nordic-npm6001-gpio.h>
+#include <zephyr/posix/unistd.h>
 #include <zephyr/shell/shell.h>
 #include <zephyr/sys/printk.h>