diff --git a/i2c.c b/i2c.c
index 5aada81..d7568e6 100644
--- a/i2c.c
+++ b/i2c.c
@@ -8,7 +8,15 @@
 
 #include "i2c.h"
 
-#if defined (__AVR_ATmega328__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega168PA__) || defined(__AVR_ATmega88P__) || defined(__AVR_ATmega48P__) || defined(__AVR_ATmega1284P__) || defined (__AVR_ATmega324A__) || defined (__AVR_ATmega324P__) || defined (__AVR_ATmega324PA__) || defined (__AVR_ATmega644__) || defined (__AVR_ATmega644A__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega644PA__) || defined (__AVR_ATmega1284P__)
+#if defined (__AVR_ATmega328__) || defined(__AVR_ATmega328P__) || \
+defined(__AVR_ATmega168P__) || defined(__AVR_ATmega168PA__) || \
+defined(__AVR_ATmega88P__) || \
+defined(__AVR_ATmega48P__) || \
+defined(__AVR_ATmega1284P__) || \
+defined (__AVR_ATmega324A__) || defined (__AVR_ATmega324P__) || defined (__AVR_ATmega324PA__) || \
+defined (__AVR_ATmega644__) || defined (__AVR_ATmega644A__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega644PA__) || \
+defined (__AVR_ATmega1284P__) || \
+defined (__AVR_ATmega2560__)
 #if PSC_I2C != 1 && PSC_I2C != 4 && PSC_I2C != 16 && PSC_I2C != 64
 #error "Wrong prescaler for TWI !"
 #elif SET_TWBR < 0 || SET_TWBR > 255