diff --git a/Src/subdir.mk b/Src/subdir.mk
index f69e597b..add36d7e 100644
--- a/Src/subdir.mk
+++ b/Src/subdir.mk
@@ -54,7 +54,7 @@ build/%.o: Src/%.c
 	@echo 'Building file: $<'
 	@echo 'Invoking: MCU GCC Compiler'
 	@echo $(PWD)
-	arm-none-eabi-gcc -mcpu=cortex-m3 -mthumb -mfloat-abi=soft '-D__weak=__attribute__((weak))' -DARM_MATH_CM3 '-D__packed=__attribute__((__packed__))' -DUSE_HAL_DRIVER -DSTM32F103x6 -I $(INC_PATH) -I $(DRIVERS_PATH) -I $(LEGACY_PATH) -I $(DEVICE_PATH) -I $(CMSIS_PATH) -Os -g3 -Wall -fmessage-length=0 -ffunction-sections -c -fmessage-length=0 -MMD -MP -MF"$(@:%.o=%.d)" -MT"$@" -o "$@" "$<"
+	arm-none-eabi-gcc -mcpu=cortex-m3 -mthumb -mfloat-abi=soft '-D__weak=__attribute__((weak))' -DARM_MATH_CM3 '-D__packed=__attribute__((__packed__))' -DUSE_HAL_DRIVER -DSTM32F103xB -I $(INC_PATH) -I $(DRIVERS_PATH) -I $(LEGACY_PATH) -I $(DEVICE_PATH) -I $(CMSIS_PATH) -Os -g3 -Wall -fmessage-length=0 -ffunction-sections -c -fmessage-length=0 -MMD -MP -MF"$(@:%.o=%.d)" -MT"$@" -o "$@" "$<"
 	@echo 'Finished building: $<'
 	@echo ' '