diff --git a/Firmware/timer02.c b/Firmware/timer02.c
index 8309f9401..792f3aef1 100644
--- a/Firmware/timer02.c
+++ b/Firmware/timer02.c
@@ -2,6 +2,9 @@
 // use atmega timer2 as main system timer instead of timer0
 // timer0 is used for fast pwm (OC0B output)
 // original OVF handler is disabled
+
+#ifdef SYSTEM_TIMER_2
+
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include "Arduino.h"
@@ -166,3 +169,5 @@ void noTone2(__attribute__((unused)) uint8_t _pin)
 {
 	PIN_CLR(BEEPER);
 }
+
+#endif //SYSTEM_TIMER_2