diff --git a/battleship.c b/battleship.c
index 6061b7c..963d16f 100644
--- a/battleship.c
+++ b/battleship.c
@@ -24,6 +24,7 @@ You should have received a copy of the CC0 Public Domain Dedication along with t
 #define ALL 0x7c
 #define RED 3
 #define CYAN 2
+#define ENGLISH_LETTERS 26
 typedef signed char byte;
 typedef unsigned char bitbox;