diff --git a/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/commands/inserttilescommand.cpp b/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/commands/inserttilescommand.cpp
index 9b861873..7bc7fd0f 100644
--- a/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/commands/inserttilescommand.cpp
+++ b/src/nostalgia/modules/gfx/src/studio/tilesheeteditor/commands/inserttilescommand.cpp
@@ -9,20 +9,19 @@ namespace nostalgia::gfx {
 InsertTilesCommand::InsertTilesCommand(
 		TileSheet &img,
 		TileSheet::SubSheetIdx idx,
-		std::size_t tileIdx,
-		std::size_t tileCnt) noexcept:
-		m_img(img),
-		m_idx(std::move(idx)) {
-	const unsigned bytesPerTile = m_img.bpp == 4 ? PixelsPerTile / 2 : PixelsPerTile;
-	m_insertPos = tileIdx * bytesPerTile;
-	m_insertCnt = tileCnt * bytesPerTile;
+		std::size_t const tileIdx,
+		std::size_t const tileCnt) noexcept:
+		m_img{img},
+		m_idx{std::move(idx)} {
+	m_insertPos = tileIdx * PixelsPerTile;
+	m_insertCnt = tileCnt * PixelsPerTile;
 	m_deletedPixels.resize(m_insertCnt);
 	// copy pixels to be erased
 	{
 		auto &s = getSubSheet(m_img, m_idx);
 		auto &p = s.pixels;
-		auto dst = m_deletedPixels.begin();
-		auto src = p.begin() + p.size() - m_insertCnt;
+		auto const dst = m_deletedPixels.begin();
+		auto const src = p.begin() + p.size() - m_insertCnt;
 		ox::copy_n(src, m_insertCnt, dst);
 	}
 }
@@ -32,7 +31,7 @@ OX_ALLOW_UNSAFE_BUFFERS_BEGIN
 ox::Error InsertTilesCommand::redo() noexcept {
 	auto &s = getSubSheet(m_img, m_idx);
 	auto &p = s.pixels;
-	auto dstPos = m_insertPos + m_insertCnt;
+	auto const dstPos = m_insertPos + m_insertCnt;
 	auto const src = &p[m_insertPos];
 	if (dstPos < p.size()) {
 		auto const dst = &p[dstPos];