diff --git a/firmware/controllers/engine_cycle/aux_valves.cpp b/firmware/controllers/engine_cycle/aux_valves.cpp
index 898e46a8b9..d0e222cedb 100644
--- a/firmware/controllers/engine_cycle/aux_valves.cpp
+++ b/firmware/controllers/engine_cycle/aux_valves.cpp
@@ -22,7 +22,11 @@
 
 EXTERN_ENGINE;
 
-void plainPinTurnOn(AuxActor *current) {
+static void plainPinTurnOff(NamedOutputPin *output) {
+	output->setLow();
+}
+
+void auxPlainPinTurnOn(AuxActor *current) {
 	NamedOutputPin *output = &enginePins.auxValve[current->valveIndex];
 	output->setHigh();
 
@@ -35,7 +39,7 @@ void plainPinTurnOn(AuxActor *current) {
 			TRIGGER_EVENT_UNDEFINED,
 			getTimeNowNt(),
 			current->extra + engine->engineState.auxValveStart,
-			{ plainPinTurnOn, current }
+			{ auxPlainPinTurnOn, current }
 			PASS_ENGINE_PARAMETER_SUFFIX
 			);
 
@@ -52,10 +56,6 @@ void plainPinTurnOn(AuxActor *current) {
 			);
 	}
 
-void plainPinTurnOff(NamedOutputPin *output) {
-	output->setLow();
-}
-
 void initAuxValves(Logging *sharedLogger DECLARE_ENGINE_PARAMETER_SUFFIX) {
 	UNUSED(sharedLogger);
 	if (engineConfiguration->auxValves[0] == GPIO_UNASSIGNED) {
@@ -83,7 +83,7 @@ void initAuxValves(Logging *sharedLogger DECLARE_ENGINE_PARAMETER_SUFFIX) {
 					TRIGGER_EVENT_UNDEFINED,
 					getTimeNowNt(),
 					actor->extra + engine->engineState.auxValveStart,
-					{ plainPinTurnOn, actor }
+					{ auxPlainPinTurnOn, actor }
 					PASS_ENGINE_PARAMETER_SUFFIX
 					);
 		}
diff --git a/firmware/controllers/engine_cycle/aux_valves.h b/firmware/controllers/engine_cycle/aux_valves.h
index 3909107762..db84f0d820 100644
--- a/firmware/controllers/engine_cycle/aux_valves.h
+++ b/firmware/controllers/engine_cycle/aux_valves.h
@@ -11,5 +11,4 @@
 
 void initAuxValves(Logging *sharedLogger DECLARE_ENGINE_PARAMETER_SUFFIX);
 void recalculateAuxValveTiming(DECLARE_ENGINE_PARAMETER_SIGNATURE);
-void plainPinTurnOn(AuxActor *current);
-void plainPinTurnOff(NamedOutputPin *output);
+void auxPlainPinTurnOn(AuxActor *current);
diff --git a/unit_tests/tests/test_aux_valves.cpp b/unit_tests/tests/test_aux_valves.cpp
index 0f5426941f..d199da8590 100644
--- a/unit_tests/tests/test_aux_valves.cpp
+++ b/unit_tests/tests/test_aux_valves.cpp
@@ -22,8 +22,8 @@ TEST(misc, testAuxValves) {
 	eth.fireTriggerEvents2(2 /* count */ , 600 /* ms */);
 	ASSERT_EQ( 100,  GET_RPM()) << "spinning-RPM#1";
 
-	eth.assertTriggerEvent("a0", 0, &engine->auxValves[0][0].open, (void*)&plainPinTurnOn, 7, 86);
-	eth.assertTriggerEvent("a1", 1, &engine->auxValves[0][1].open, (void*)&plainPinTurnOn, 3, 86);
-	eth.assertTriggerEvent("a2", 2, &engine->auxValves[1][0].open, (void*)&plainPinTurnOn, 1, 86);
+	eth.assertTriggerEvent("a0", 0, &engine->auxValves[0][0].open, (void*)&auxPlainPinTurnOn, 7, 86);
+	eth.assertTriggerEvent("a1", 1, &engine->auxValves[0][1].open, (void*)&auxPlainPinTurnOn, 3, 86);
+	eth.assertTriggerEvent("a2", 2, &engine->auxValves[1][0].open, (void*)&auxPlainPinTurnOn, 1, 86);
 
 }