diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 990340a9b10c..0a39c5f39378 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -2261,11 +2261,11 @@ static int bmp580_nvmem_read(void *priv, unsigned int offset, void *val,
 	return ret;
 }
 
-static int bmp580_nvmem_write_impl(void *priv, unsigned int offset, void *val,
+static int bmp580_nvmem_write_impl(void *priv, unsigned int offset, const void *val,
 				   size_t bytes)
 {
 	struct bmp280_data *data = priv;
-	u16 *buf = val;
+	const u16 *buf = val;
 	int ret, addr;
 
 	guard(mutex)(&data->lock);
@@ -2322,7 +2322,7 @@ static int bmp580_nvmem_write_impl(void *priv, unsigned int offset, void *val,
 	return ret;
 }
 
-static int bmp580_nvmem_write(void *priv, unsigned int offset, void *val,
+static int bmp580_nvmem_write(void *priv, unsigned int offset, const void *val,
 			      size_t bytes)
 {
 	struct bmp280_data *data = priv;