diff --git a/drivers/flash/spi_nor.c b/drivers/flash/spi_nor.c
index f064f4179de..3e1b0c169b1 100644
--- a/drivers/flash/spi_nor.c
+++ b/drivers/flash/spi_nor.c
@@ -1676,11 +1676,19 @@ flash_nor_get_parameters(const struct device *dev)
 	return &flash_nor_parameters;
 }
 
+static int flash_nor_get_size(const struct device *dev, uint64_t *size)
+{
+	*size = (uint64_t)dev_flash_size(dev);
+
+	return 0;
+}
+
 static const struct flash_driver_api spi_nor_api = {
 	.read = spi_nor_read,
 	.write = spi_nor_write,
 	.erase = spi_nor_erase,
 	.get_parameters = flash_nor_get_parameters,
+	.get_size = flash_nor_get_size,
 #if defined(CONFIG_FLASH_PAGE_LAYOUT)
 	.page_layout = spi_nor_pages_layout,
 #endif
diff --git a/tests/drivers/flash/common/boards/nrf52840dk_flash_spi.conf b/tests/drivers/flash/common/boards/nrf52840dk_flash_spi.conf
index 8d6e65493ef..531e6ff66b6 100644
--- a/tests/drivers/flash/common/boards/nrf52840dk_flash_spi.conf
+++ b/tests/drivers/flash/common/boards/nrf52840dk_flash_spi.conf
@@ -1,3 +1,4 @@
 CONFIG_SPI=y
 CONFIG_SPI_NOR=y
 CONFIG_SOC_FLASH_NRF=n
+CONFIG_TEST_DRIVER_FLASH_SIZE=2097152