diff --git a/Firmware/temperature.cpp b/Firmware/temperature.cpp
index 53f5fe6c5..7672d7f2e 100755
--- a/Firmware/temperature.cpp
+++ b/Firmware/temperature.cpp
@@ -244,14 +244,6 @@ static void temp_runaway_check(uint8_t _heater_id, float _target_temperature, fl
 static void temp_runaway_stop(bool isPreheat, bool isBed);
 #endif
 
-// return "false", if all extruder-heaters are 'off' (ie. "true", if any heater is 'on')
-bool checkAllHotends(void)
-{
-    bool result=false;
-    for(int i=0;i<EXTRUDERS;i++) result=(result||(target_temperature[i]!=0));
-    return(result);
-}
-
 // WARNING: the following function has been marked noinline to avoid a GCC 4.9.2 LTO
 //          codegen bug causing a stack overwrite issue in process_commands()
 void __attribute__((noinline)) PID_autotune(float temp, int extruder, int ncycles)
diff --git a/Firmware/temperature.h b/Firmware/temperature.h
index cc018be0f..1e0a5c148 100755
--- a/Firmware/temperature.h
+++ b/Firmware/temperature.h
@@ -30,8 +30,6 @@ void temp_mgr_init(); //initialize the temperature handler
 void manage_heater(); //it is critical that this is called periodically.
 bool get_temp_error(); //return true if any thermal error is set
 
-extern bool checkAllHotends(void);
-
 // low level conversion routines
 // do not use these routines and variables outside of temperature.cpp
 extern int target_temperature[EXTRUDERS];  
@@ -156,7 +154,7 @@ FORCE_INLINE bool isCoolingBed() {
 #define isCoolingHotend0() isCoolingHotend(0)
 
 // return "false", if all heaters are 'off' (ie. "true", if any heater is 'on')
-#define CHECK_ALL_HEATERS (checkAllHotends()||(target_temperature_bed!=0))
+#define CHECK_ALL_HEATERS ((target_temperature[0] != 0) || (target_temperature_bed != 0))
 
 int getHeaterPower(int heater);
 void disable_heater(); // Disable all heaters *instantaneously*