diff --git a/Grbl_Esp32/stepper.cpp b/Grbl_Esp32/stepper.cpp
index 54bc013e..fe68ae1c 100644
--- a/Grbl_Esp32/stepper.cpp
+++ b/Grbl_Esp32/stepper.cpp
@@ -216,8 +216,9 @@ static st_prep_t prep;
 // with probing and homing cycles that require true real-time positions.
 void IRAM_ATTR onStepperDriverTimer(void *para)  // ISR It is time to take a step =======================================================================================
 {
-	uint64_t step_pulse_off_time;
-
+	#ifndef USE_RMT_STEPS
+		uint64_t step_pulse_off_time;
+	#endif
 	//const int timer_idx = (int)para;  // get the timer index
 
 	TIMERG0.int_clr_timers.t0 = 1;