diff --git a/cpu/at90can128/global.make b/cpu/at90can128/global.make
index 4e6a5b8..a5a8089 100755
--- a/cpu/at90can128/global.make
+++ b/cpu/at90can128/global.make
@@ -3,3 +3,4 @@ CFLAGS+=-ggdb -mmcu=at90can128 -Wall -Os
 ASFLAGS+=-ggdb -mmcu=at90can128
 LDFLAGS+=-ggdb -mmcu=at90can128
 
+AVR_MCU=c128