diff --git a/src/games/reversi/core.ts b/src/games/reversi/core.ts
index 9199efa09..481b5b0f7 100644
--- a/src/games/reversi/core.ts
+++ b/src/games/reversi/core.ts
@@ -110,7 +110,7 @@ export default class Reversi {
 	 * 白石の数
 	 */
 	public get whiteCount() {
-		return count(BLACK, this.board);
+		return count(WHITE, this.board);
 	}
 
 	/**