diff --git a/Marlin/src/module/temperature.h b/Marlin/src/module/temperature.h
index 3b419f2a59..478e49d07c 100644
--- a/Marlin/src/module/temperature.h
+++ b/Marlin/src/module/temperature.h
@@ -547,7 +547,7 @@ class Temperature {
   private:
 
     #if ENABLED(FAST_PWM_FAN)
-      static void setPwmFrequency(const uint8_t pin, int val);
+      static void setPwmFrequency(const pin_t pin, int val);
     #endif
 
     static void set_current_temp_raw();