diff --git a/include/cbm610.h b/include/cbm610.h
index b0486044b..de7aa50f8 100644
--- a/include/cbm610.h
+++ b/include/cbm610.h
@@ -85,7 +85,8 @@
 #define SID     (*(struct __sid*)0xDA00)
 
 #include <_6526.h>
-#define CIA     (*(struct __6526*)0xDC00)
+#define CIA1    (*(struct __6526*)0xDB00)
+#define CIA2    (*(struct __6526*)0xDC00)
 
 #include <_6551.h>
 #define ACIA    (*(struct __6551*)0xDD00)