diff --git a/drivers/iio/magnetometer/ak8974.c b/drivers/iio/magnetometer/ak8974.c
index 76091da20a0ced0fefed356a630d57abe0e2e8a4..b1c209faf1b12c640eac746ec49fef2560826df9 100644
--- a/drivers/iio/magnetometer/ak8974.c
+++ b/drivers/iio/magnetometer/ak8974.c
@@ -20,6 +20,7 @@
 #include <linux/mutex.h>
 #include <linux/delay.h>
 #include <linux/bitops.h>
+#include <linux/random.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/pm_runtime.h>
@@ -470,6 +471,7 @@ static int ak8974_detect(struct ak8974 *ak8974)
 		ret = ak8974_get_u16_val(ak8974, AMI305_SN, &sn);
 		if (ret)
 			return ret;
+		add_device_randomness(&sn, sizeof(sn));
 		dev_info(&ak8974->i2c->dev,
 			 "detected %s, FW ver %02x, S/N: %04x\n",
 			 name, fw, sn);