diff --git a/boot/zephyr/prj.conf b/boot/zephyr/prj.conf
index caf48f9..515bd55 100644
--- a/boot/zephyr/prj.conf
+++ b/boot/zephyr/prj.conf
@@ -12,6 +12,7 @@
 CONFIG_HEAP_MEM_POOL_SIZE=16384
 
 CONFIG_FLASH=y
+CONFIG_MPU_ALLOW_FLASH_WRITE=y
 
 ### Disable Bluetooth by default
 # CONFIG_BLUETOOTH is not set