diff --git a/src/stm32/Kconfig b/src/stm32/Kconfig
index c8466df38..14e140709 100644
--- a/src/stm32/Kconfig
+++ b/src/stm32/Kconfig
@@ -311,6 +311,8 @@ choice
         bool "2KiB bootloader" if MACH_STM32F103
     config STM32_FLASH_START_1000
         bool "4KiB bootloader" if MACH_STM32F1 || MACH_STM32F0
+    config STM32_FLASH_START_1800
+        bool "6KiB bootloader" if MACH_STM32F1 || MACH_STM32F0 || MACH_STM32G0
     config STM32_FLASH_START_4000
         bool "16KiB bootloader" if MACH_STM32F207 || MACH_STM32F401 || MACH_STM32F4x5 || MACH_STM32F103 || MACH_STM32F072
     config STM32_FLASH_START_20000
@@ -323,6 +325,7 @@ config FLASH_APPLICATION_ADDRESS
     hex
     default 0x8000800 if STM32_FLASH_START_800
     default 0x8001000 if STM32_FLASH_START_1000
+    default 0x8001800 if STM32_FLASH_START_1800
     default 0x8002000 if STM32_FLASH_START_2000
     default 0x8004000 if STM32_FLASH_START_4000
     default 0x8005000 if STM32_FLASH_START_5000