diff --git a/boot.c b/boot.c
index 84c061f..273e672 100644
--- a/boot.c
+++ b/boot.c
@@ -2,14 +2,14 @@
 #include <stdbool.h>
 #include "hedley.h"
 
-#define BOARD ((Cell*)0x7F00)
-
 typedef enum : char {
 	NONE  = ' ',
 	CROSS = 'X',
 	NOT   = 'O'
 } Cell;
 
+Cell* board = ((Cell*)0x7F00);
+
 HEDLEY_ALWAYS_INLINE char readchar(void);
 HEDLEY_ALWAYS_INLINE bool checkwin(Cell c);
 HEDLEY_NEVER_INLINE void putchar(char);
@@ -26,7 +26,7 @@ void _start(void) {
 	Cell cur = CROSS;
 	for (char i = 0; i < 3; i++)
 		for (char j = 0; j < 3; j++)
-			BOARD[i * 3 + j] = NONE;
+			board[i * 3 + j] = NONE;
 	while (1) {
 		printboard();
 		char k = readchar();
@@ -40,9 +40,9 @@ void _start(void) {
 		else
 			o = (0x2C - 8);
 		size_t c = numpadkeys[k - o];
-		if (BOARD[c] != NONE)
+		if (board[c] != NONE)
 			continue;
-		BOARD[c] = cur;
+		board[c] = cur;
 		if (checkwin(cur))
 			break;
 		if (cur == CROSS)
@@ -73,7 +73,7 @@ void printboard(void) {
 	);
 	for (char i = 0; i < 3; i++) {
 		for (char j = 0; j < 3; j++) {
-			putchar(BOARD[i * 3 + j]);
+			putchar(board[i * 3 + j]);
 		}
 		putchar('\n');
 		putchar('\r');
@@ -83,14 +83,14 @@ void printboard(void) {
 HEDLEY_ALWAYS_INLINE
 bool checkwin(Cell c) {
 	for (size_t i = 0; i <= 2; i++)
-		if ((BOARD[i] == c) && (BOARD[i + 3] == c) && (BOARD[i + 6] == c))
+		if ((board[i] == c) && (board[i + 3] == c) && (board[i + 6] == c))
 			return true;
 	for (size_t i = 0; i <= 2; i++)
-		if ((BOARD[3*i] == c) && (BOARD[3*i + 1] == c) && (BOARD[3*i + 2] == c))
+		if ((board[3*i] == c) && (board[3*i + 1] == c) && (board[3*i + 2] == c))
 			return true;
-	if (BOARD[0] == c && BOARD[4] == c && BOARD[8] == c)
+	if (board[0] == c && board[4] == c && board[8] == c)
 		return true;
-	if (BOARD[2] == c && BOARD[4] == c && BOARD[6] == c)
+	if (board[2] == c && board[4] == c && board[6] == c)
 		return true;
 	return false;
 }