--- nono/vm/mainbus.h	2026/04/29 17:05:33	1.1.1.5
+++ nono/vm/mainbus.h	2026/04/29 17:05:50	1.1.1.6
@@ -51,8 +51,8 @@ class AccStat
 	static const uint SHIFT = 21;
 
 	// メイン空間とバンクメモリ(1枚分)の要素数
-	static const uint MAINLEN	= (1 << (32 - SHIFT));
-	static const uint BANKLEN	= (1 << (24 - SHIFT));
+	static const uint MAINLEN	= (1U << (32 - SHIFT));
+	static const uint BANKLEN	= (1U << (24 - SHIFT));
 
 	// アクセス状況
 	static const uint8 WRITE	= 0x01;