diff --git a/src/nostalgia/modules/core/include/nostalgia/core/tilesheet.hpp b/src/nostalgia/modules/core/include/nostalgia/core/tilesheet.hpp
index 6255442c..09166652 100644
--- a/src/nostalgia/modules/core/include/nostalgia/core/tilesheet.hpp
+++ b/src/nostalgia/modules/core/include/nostalgia/core/tilesheet.hpp
@@ -233,10 +233,12 @@ struct TileSheetV4 {
 [[nodiscard]]
 constexpr bool valid(TileSheetV4::SubSheet const&ss, int bpp) noexcept {
 	auto const bytes = static_cast<size_t>(ss.columns * ss.rows * PixelsPerTile) / (bpp == 4 ? 2 : 1);
-	return ox::all_of(ss.subsheets.begin(), ss.subsheets.end(),
-			[bpp, bytes](TileSheetV4::SubSheet const&s) {
-		return bytes == s.pixels.size() && valid(s, bpp);
-	});
+	return
+		(ss.pixels.empty() || ss.subsheets.empty()) &&
+		ox::all_of(ss.subsheets.begin(), ss.subsheets.end(),
+				[bpp, bytes](TileSheetV4::SubSheet const&s) {
+			return bytes == s.pixels.size() && valid(s, bpp);
+		});
 }
 
 [[nodiscard]]
@@ -245,8 +247,14 @@ constexpr bool valid(TileSheetV4 const&ts) noexcept {
 }
 
 constexpr void repair(TileSheetV4::SubSheet &ss, int bpp) noexcept {
-	auto const bytes = static_cast<size_t>(ss.columns * ss.rows * PixelsPerTile) / (bpp == 4 ? 2 : 1);
-	ss.pixels.resize(bytes);
+	if (ss.subsheets.empty()) {
+		auto const bytes = static_cast<size_t>(ss.columns * ss.rows * PixelsPerTile) / (bpp == 4 ? 2 : 1);
+		ss.pixels.resize(bytes);
+	} else {
+		ss.pixels.clear();
+		ss.columns = -1;
+		ss.rows = -1;
+	}
 	for (auto &s : ss.subsheets) {
 		repair(s, bpp);
 	}