diff --git a/server/drivers/CFontz633.h b/server/drivers/CFontz633.h
index 2c0c709..bd685fa 100644
--- a/server/drivers/CFontz633.h
+++ b/server/drivers/CFontz633.h
@@ -11,6 +11,7 @@
 #define DEFAULT_BRIGHTNESS 100
 #define DEFAULT_OFFBRIGHTNESS 0
 #define DEFAULT_SIZE "16x2"
+#define	DEFAULT_SIZE_CF635 "20x4"
 #define	DEFAULT_SIZE_CF633 "16x2"
 #define	DEFAULT_SIZE_CF631 "20x2"