diff --git a/src/client/app/common/views/components/reversi.game.vue b/src/client/app/common/views/components/reversi.game.vue
index 2f41a4431a..b3790f4847 100644
--- a/src/client/app/common/views/components/reversi.game.vue
+++ b/src/client/app/common/views/components/reversi.game.vue
@@ -15,7 +15,7 @@
 
 	<div class="board">
 		<div class="labels-x" v-if="this.$store.state.settings.reversiBoardLabels">
-			<span v-for="i in game.settings.map[0].length">{{ String.fromCharCode(96 + i) }}</span>
+			<span v-for="i in game.settings.map[0].length">{{ String.fromCharCode(64 + i) }}</span>
 		</div>
 		<div class="flex">
 			<div class="labels-y" v-if="this.$store.state.settings.reversiBoardLabels">
@@ -25,7 +25,7 @@
 				<div v-for="(stone, i) in o.board"
 						:class="{ empty: stone == null, none: o.map[i] == 'null', isEnded: game.isEnded, myTurn: !game.isEnded && isMyTurn, can: turnUser ? o.canPut(turnUser.id == blackUser.id, i) : null, prev: o.prevPos == i }"
 						@click="set(i)"
-						:title="`${String.fromCharCode(97 + o.transformPosToXy(i)[0])}${o.transformPosToXy(i)[1] + 1}`">
+						:title="`${String.fromCharCode(65 + o.transformPosToXy(i)[0])}${o.transformPosToXy(i)[1] + 1}`">
 					<img v-if="stone === true" :src="`${blackUser.avatarUrl}?thumbnail&size=128`" alt="">
 					<img v-if="stone === false" :src="`${whiteUser.avatarUrl}?thumbnail&size=128`" alt="">
 				</div>