diff --git a/include/cbm.h b/include/cbm.h
index d9b31543f..96eb675cd 100644
--- a/include/cbm.h
+++ b/include/cbm.h
@@ -121,6 +121,8 @@ extern char _filetype;          /* Defaults to 's' */
 #define CH_STOP           3
 #define CH_LIRA          92
 #define CH_ESC           27
+#define CH_FONT_LOWER    14
+#define CH_FONT_UPPER   142