diff --git a/firmware/controllers/core/fsio_impl.cpp b/firmware/controllers/core/fsio_impl.cpp
index 3e1a3595b7..ce1444d762 100644
--- a/firmware/controllers/core/fsio_impl.cpp
+++ b/firmware/controllers/core/fsio_impl.cpp
@@ -609,8 +609,7 @@ static void setFsioSetting(float humanIndexF, float value) {
 #endif
 }
 
-void setFsioExpression(const char *indexStr, const char *quotedLine) {
-#if EFI_PROD_CODE || EFI_SIMULATOR
+void setFsioExpression(const char *indexStr, const char *quotedLine DECLARE_ENGINE_PARAMETER_SUFFIX) {
 	int index = atoi(indexStr) - 1;
 	if (index < 0 || index >= FSIO_COMMAND_COUNT) {
 		scheduleMsg(logger, "invalid FSIO index: %d", index);
@@ -627,7 +626,6 @@ void setFsioExpression(const char *indexStr, const char *quotedLine) {
 	// this would apply the changes
 	applyFsioConfiguration(PASS_ENGINE_PARAMETER_SIGNATURE);
 	showFsioInfo();
-#endif
 }
 
 static void rpnEval(char *line) {
diff --git a/firmware/controllers/core/fsio_impl.h b/firmware/controllers/core/fsio_impl.h
index 45a4ae2026..f9f728dadc 100644
--- a/firmware/controllers/core/fsio_impl.h
+++ b/firmware/controllers/core/fsio_impl.h
@@ -35,7 +35,7 @@ void setFsioExt(int index, brain_pin_e pin, const char * exp, int pwmFrequency D
 
 void initFsioImpl(Logging *sharedLogger DECLARE_ENGINE_PARAMETER_SUFFIX);
 void runFsio(DECLARE_ENGINE_PARAMETER_SIGNATURE);
-void setFsioExpression(const char *indexStr, const char *quotedLine);
+void setFsioExpression(const char *indexStr, const char *quotedLine DECLARE_ENGINE_PARAMETER_SUFFIX);
 float getFsioOutputValue(int index DECLARE_ENGINE_PARAMETER_SUFFIX);
 void applyFsioConfiguration(DECLARE_ENGINE_PARAMETER_SIGNATURE);
 void onConfigurationChangeFsioCallback(engine_configuration_s *previousConfiguration DECLARE_ENGINE_PARAMETER_SUFFIX);
diff --git a/unit_tests/tests/test_idle_controller.cpp b/unit_tests/tests/test_idle_controller.cpp
index c87838c402..566f44fc72 100644
--- a/unit_tests/tests/test_idle_controller.cpp
+++ b/unit_tests/tests/test_idle_controller.cpp
@@ -11,15 +11,20 @@
 #include "pid.h"
 #include "fsio_impl.h"
 
+#define Q(x) #x
+#define QUOTE(x) Q(x)
+
 TEST(idle, fsioPidParameters) {
 	WITH_ENGINE_TEST_HELPER(TEST_ENGINE);
 
 	// todo finish this unit test!
 	engineConfiguration->useFSIO12ForIdleOffset = true;
-	setFsioExpression(MAGIC_OFFSET_FOR_IDLE_OFFSET, "\"ac_on_switch cfg_idleRpmPid_offset cfg_idleRpmPid2_offset if");
+	setFsioExpression(QUOTE(MAGIC_OFFSET_FOR_IDLE_OFFSET), "\"ac_on_switch cfg_idleRpmPid_offset cfg_idleRpmPid2_offset if" PASS_ENGINE_PARAMETER_SUFFIX);
 
 	engineConfiguration->useFSIO13ForIdleMinValue = true;
-	setFsioExpression(MAGIC_OFFSET_FOR_IDLE_MIN_VALUE, "\"ac_on_switch cfg_idleRpmPid_minValue cfg_idleRpmPid2_minValue if");
+	setFsioExpression(QUOTE(MAGIC_OFFSET_FOR_IDLE_MIN_VALUE), "\"ac_on_switch cfg_idleRpmPid_minValue cfg_idleRpmPid2_minValue if" PASS_ENGINE_PARAMETER_SUFFIX);
+
+	eth.engine.periodicSlowCallback(PASS_ENGINE_PARAMETER_SIGNATURE);
 }
 
 TEST(idle, pid) {