diff --git a/oldloader.c b/oldloader.c
index 60efe0a95c..f8d9c975e7 100644
--- a/oldloader.c
+++ b/oldloader.c
@@ -1034,7 +1034,7 @@ static bool LoadOldPlayer(LoadgameState *ls, int num)
 	} else {
 		/* Beside some multiplayer maps (1 on 1), which we don't official support,
 		all other players are an AI.. mark them as such */
-		p->is_ai = 1;
+		p->is_ai = true;
 	}
 
 	/* Sometimes it is better to not ask.. in old scenarios, the money
diff --git a/player.h b/player.h
index e6ed1fe2e7..3195e1c7ff 100644
--- a/player.h
+++ b/player.h
@@ -182,7 +182,7 @@ typedef struct Player {
 	int32 bankrupt_value;
 
 	bool is_active;
-	byte is_ai;
+	bool is_ai;
 	PlayerAI ai;
 	PlayerAiNew ainew;