diff --git a/core/ctk/Makefile.core-ctk b/core/ctk/Makefile.core-ctk
new file mode 100644
index 000000000..7610895f7
--- /dev/null
+++ b/core/ctk/Makefile.core-ctk
@@ -0,0 +1 @@
+core-ctk_src = ctk.c ctk-conio.c
diff --git a/cpu/6502/Makefile.6502 b/cpu/6502/Makefile.6502
index ade64d75a..10dc4a03b 100644
--- a/cpu/6502/Makefile.6502
+++ b/cpu/6502/Makefile.6502
@@ -69,4 +69,4 @@ LDFLAGS = $(STARTADDR_FLAG) -t $(TARGET) -m contiki-$(TARGET).map -D __STACKSIZE
 AROPTS  = a
 
 ## Default modules
-MODULES += core/net/ipv4
+MODULES += core/net/ipv4 core/ctk