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-rwxr-xr-xcores/arduino/Arduino.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/cores/arduino/Arduino.h b/cores/arduino/Arduino.h
index 830c995..b265825 100755
--- a/cores/arduino/Arduino.h
+++ b/cores/arduino/Arduino.h
@@ -46,7 +46,7 @@ extern "C"{
#define EXTERNAL 1
#define INTERNAL 2
#else
-#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1284P__)
+#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644P__)
#define INTERNAL1V1 2
#define INTERNAL2V56 3
#else