diff --git a/boot/zephyr/boards/thingy53_nrf5340_cpuapp.conf b/boot/zephyr/boards/thingy53_nrf5340_cpuapp.conf
index bbef18460..4c27c5da6 100644
--- a/boot/zephyr/boards/thingy53_nrf5340_cpuapp.conf
+++ b/boot/zephyr/boards/thingy53_nrf5340_cpuapp.conf
@@ -73,3 +73,6 @@ CONFIG_FLASH_SIMULATOR_STATS=n
 # Enable custom command to erase settings partition.
 CONFIG_ENABLE_MGMT_PERUSER=y
 CONFIG_BOOT_MGMT_CUSTOM_STORAGE_ERASE=y
+
+CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
+CONFIG_LTO=y