diff --git a/src/platform/STM32/mk/STM32H5.mk b/src/platform/STM32/mk/STM32H5.mk
index 90a30cc32b..13c5a59cb3 100644
--- a/src/platform/STM32/mk/STM32H5.mk
+++ b/src/platform/STM32/mk/STM32H5.mk
@@ -112,22 +112,18 @@ DEFAULT_LD_SCRIPT   = $(LINKER_DIR)/stm32_flash_h563_2m.ld
 STARTUP_SRC         = STM32/startup/startup_stm32h563xx.s
 MCU_FLASH_SIZE     := 2048
 DEVICE_FLAGS       += -DMAX_MPU_REGIONS=16
-
 # end H563xx
-
+else
+$(error Unknown MCU for STM32H5 target)
+endif
 
 ifneq ($(DEBUG),GDB)
 OPTIMISE_DEFAULT    := -Os
 OPTIMISE_SPEED      := -Os
 OPTIMISE_SIZE       := -Os
-
 LTO_FLAGS           := $(OPTIMISATION_BASE) $(OPTIMISE_DEFAULT)
 endif
 
-else
-$(error Unknown MCU for STM32H5 target)
-endif
-
 ifeq ($(LD_SCRIPT),)
 LD_SCRIPT = $(DEFAULT_LD_SCRIPT)
 endif