diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index 75a0a1648..c66cb30e8 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -1357,7 +1357,7 @@ void Temperature::init() {
     millis_t Temperature::thermal_runaway_bed_timer;
   #endif
 
-  void Temperature::thermal_runaway_protection(Temperature::TRState* state, millis_t* timer, float current, float target, int heater_id, int period_seconds, int hysteresis_degc) {
+  void Temperature::thermal_runaway_protection(Temperature::TRState * const state, millis_t * const timer, const float current, const float target, const int8_t heater_id, const uint16_t period_seconds, const uint16_t hysteresis_degc) {
 
     static float tr_target_temperature[HOTENDS + 1] = { 0.0 };
 
diff --git a/Marlin/src/module/temperature.h b/Marlin/src/module/temperature.h
index 478e49d07..b31d18130 100644
--- a/Marlin/src/module/temperature.h
+++ b/Marlin/src/module/temperature.h
@@ -574,7 +574,7 @@ class Temperature {
 
       typedef enum TRState { TRInactive, TRFirstHeating, TRStable, TRRunaway } TRstate;
 
-      static void thermal_runaway_protection(TRState* state, millis_t* timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc);
+      static void thermal_runaway_protection(TRState * const state, millis_t * const timer, const float current, const float target, const int8_t heater_id, const uint16_t period_seconds, const uint16_t hysteresis_degc);
 
       #if ENABLED(THERMAL_PROTECTION_HOTENDS)
         static TRState thermal_runaway_state_machine[HOTENDS];