diff --git a/boot/zephyr/boards/nrf54l15dk_nrf54l15_cpuapp_ext_flash.conf b/boot/zephyr/boards/nrf54l15dk_nrf54l15_cpuapp_ext_flash.conf
index ec944f828..15a9a228d 100644
--- a/boot/zephyr/boards/nrf54l15dk_nrf54l15_cpuapp_ext_flash.conf
+++ b/boot/zephyr/boards/nrf54l15dk_nrf54l15_cpuapp_ext_flash.conf
@@ -1,7 +1,6 @@
 CONFIG_SPI=y
 CONFIG_SPI_NOR=y
 CONFIG_FLASH=y
-CONFIG_PM_PARTITION_SIZE_MCUBOOT=0x14000
 CONFIG_MAIN_STACK_SIZE=20480
 CONFIG_BOOT_MAX_IMG_SECTORS=512
 CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096