diff --git a/boards/nordic/thingy53/Kconfig.sysbuild b/boards/nordic/thingy53/Kconfig.sysbuild
index 2fbd8e803a1..975b8b8389d 100644
--- a/boards/nordic/thingy53/Kconfig.sysbuild
+++ b/boards/nordic/thingy53/Kconfig.sysbuild
@@ -7,6 +7,10 @@ choice BOOTLOADER
 	default BOOTLOADER_MCUBOOT
 endchoice
 
+choice MCUBOOT_MODE
+	default MCUBOOT_MODE_OVERWRITE_ONLY
+endchoice
+
 config SECURE_BOOT
 	default y