diff --git a/src/avr_usart.h b/src/avr_usart.h
index 1f95f3d..5cc14a3 100644
--- a/src/avr_usart.h
+++ b/src/avr_usart.h
@@ -4,7 +4,7 @@
  * Description: AT-09 Bluetooth module library for AVR micro crontrollers.
  * Filename: avr_at-09.h
  */
-#define __AVR_ATmega328P__
+//#define __AVR_ATmega328P__
 #include <inttypes.h>
 #include <stdint.h>