diff --git a/firmware/config/boards/proteus/board.mk b/firmware/config/boards/proteus/board.mk
index 16e3936156..5545102604 100644
--- a/firmware/config/boards/proteus/board.mk
+++ b/firmware/config/boards/proteus/board.mk
@@ -28,6 +28,8 @@ DDEFS += -DFIRMWARE_ID=\"proteus\" -DDEFAULT_ENGINE_TYPE=PROTEUS_DEFAULTS
 DDEFS += -DEFI_INCLUDE_ENGINE_PRESETS=FALSE
 DDEFS += -DEFI_ICU_INPUTS=FALSE -DHAL_TRIGGER_USE_PAL=TRUE
 DDEFS += -DEFI_LOGIC_ANALYZER=FALSE
+# todo: refactor HAL_VSS_USE_PAL
+DDEFS += -DHAL_VSS_USE_PAL=TRUE
 DDEFS += -DSTM32_ADC_USE_ADC3=TRUE
 DDEFS += -DEFI_SOFTWARE_KNOCK=TRUE
 DDEFS += -DEFI_CONSOLE_TX_BRAIN_PIN=GPIO_UNASSIGNED -DEFI_CONSOLE_RX_BRAIN_PIN=GPIO_UNASSIGNED
diff --git a/firmware/hw_layer/vehicle_speed.cpp b/firmware/hw_layer/vehicle_speed.cpp
index c7efab225e..1c9a9b4775 100644
--- a/firmware/hw_layer/vehicle_speed.cpp
+++ b/firmware/hw_layer/vehicle_speed.cpp
@@ -90,6 +90,7 @@ void startVSSPins(void) {
 		return;
 	}
 
+// todo: refactor https://github.com/rusefi/rusefi/issues/2123
 #if HAL_VSS_USE_PAL
 	ioline_t pal_line = PAL_LINE(getHwPort("vss", CONFIG(vehicleSpeedSensorInputPin)), getHwPin("vss", CONFIG(vehicleSpeedSensorInputPin)));
 	efiExtiEnablePin("VSS", CONFIG(vehicleSpeedSensorInputPin), PAL_EVENT_MODE_BOTH_EDGES, vsExtiCallback, (void *)pal_line);