diff --git a/heater.h b/heater.h
index 612da2f..4c381eb 100644
--- a/heater.h
+++ b/heater.h
@@ -26,7 +26,6 @@ extern int16_t i_limit;
 void heater_init(void);
 void heater_save_settings(void);
 void heater_tick(int16_t current_temp, int16_t target_temp);
-uint8_t	temp_achieved(void);
 
 #else	/* HEATER_PIN */