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-rw-r--r--build_keyboard.mk1
1 files changed, 1 insertions, 0 deletions
diff --git a/build_keyboard.mk b/build_keyboard.mk
index 4c4ff3b5fd..38ca2aaa99 100644
--- a/build_keyboard.mk
+++ b/build_keyboard.mk
@@ -237,6 +237,7 @@ ifdef MCU_FAMILY
PLATFORM=CHIBIOS
PLATFORM_KEY=chibios
FIRMWARE_FORMAT?=bin
+ OPT_DEFS += -DMCU_$(MCU_FAMILY)
else ifdef ARM_ATSAM
PLATFORM=ARM_ATSAM
PLATFORM_KEY=arm_atsam