1 files changed, 2 insertions, 0 deletions
diff --git a/cores/arduino/Arduino.h b/cores/arduino/Arduino.h
index 425dfcb..8673ab8 100755
--- a/cores/arduino/Arduino.h
+++ b/cores/arduino/Arduino.h
@@ -115,6 +115,8 @@ typedef uint8_t byte;
 void init(void);
 void initVariant(void);
 
+int atexit(void (*func)()) __attribute__((weak));
+
 void pinMode(uint8_t, uint8_t);
 void digitalWrite(uint8_t, uint8_t);
 int digitalRead(uint8_t);