diff --git a/firmware/config/boards/proteus/board.mk b/firmware/config/boards/proteus/board.mk
index d79ab63107..1cce4af128 100644
--- a/firmware/config/boards/proteus/board.mk
+++ b/firmware/config/boards/proteus/board.mk
@@ -13,10 +13,15 @@ ifeq ($(PROJECT_CPU),ARCH_STM32F4)
   IS_STM32F429 = yes
 endif
 
-# Override DEFAULT_ENGINE_TYPE
+# Set this if you want a default engine type other than normal Proteus
+ifeq ($(DEFAULT_ENGINE_TYPE),)
+  DEFAULT_ENGINE_TYPE = -DDEFAULT_ENGINE_TYPE=PROTEUS_DEFAULTS
+endif
+
 DDEFS += -DEFI_USE_OSC=TRUE
 DDEFS += -DLED_CRITICAL_ERROR_BRAIN_PIN=GPIOE_3
-DDEFS += -DFIRMWARE_ID=\"proteus\" -DDEFAULT_ENGINE_TYPE=PROTEUS_DEFAULTS
+DDEFS += -DFIRMWARE_ID=\"proteus\" $(DEFAULT_ENGINE_TYPE)
+
 DDEFS += -DEFI_ICU_INPUTS=FALSE -DHAL_TRIGGER_USE_PAL=TRUE
 DDEFS += -DEFI_LOGIC_ANALYZER=FALSE
 # todo: refactor HAL_VSS_USE_PAL