diff --git a/cpu/atmega328p/Makefile.include b/cpu/atmega328p/Makefile.include
index b46d4e871c8f7be91fa4f2bae002050a124562cf..c014b254ccd08f40346c94fad089403946bf851c 100644
--- a/cpu/atmega328p/Makefile.include
+++ b/cpu/atmega328p/Makefile.include
@@ -4,5 +4,8 @@ USEMODULE += atmega_common
 # define path to atmega common module, which is needed for this CPU
 export ATMEGA_COMMON = $(RIOTCPU)/atmega_common/
 
+RAM_LEN = 2K
+ROM_LEN = 32K
+
 # CPU depends on the atmega common module, so include it
 include $(ATMEGA_COMMON)Makefile.include