--- nono/wx/wxplanemonitor.cpp	2026/04/29 17:05:19	1.1.1.3
+++ nono/wx/wxplanemonitor.cpp	2026/04/29 17:05:23	1.1.1.4
@@ -139,20 +139,23 @@ WXPlaneVRAMBitmapPanel::GenPalette()
 {
 	if (apply_palette) {
 		// パレットを適用する場合
-		const ColorXBGR *vmpal;
-		// 雑に X680x0/LUNA 対応
+		// (雑に X680x0/LUNA 対応)
+		const std::vector<ColorXBGR> *vmpal;
 		if (videoctlr) {
-			vmpal = &(videoctlr->GetHostPalette())[0];
+			vmpal = &videoctlr->GetHostPalette();
 		} else {
-			vmpal = &(bt45x->GetHostPalette())[0];
+			vmpal = &bt45x->GetHostPalette();
 		}
-		const Color bg = vmpal[0].ToColor();
-		for (int i = 0; i < pal.size(); i++) {
-			if ((i & planemask)) {
-				int n = i % 16;
-				pal[i] = vmpal[n].ToColor();
+		int vmpal_size = vmpal->size();
+		const Color bg = (*vmpal)[0].ToColor();
+		int d = 0;
+		int s;
+		for (; d < pal.size(); d++) {
+			s = d % vmpal_size;
+			if ((s & planemask)) {
+				pal[d] = (*vmpal)[s].ToColor();
 			} else {
-				pal[i] = bg;
+				pal[d] = bg;
 			}
 		}
 	} else {