diff --git a/src/nostalgia/modules/core/include/nostalgia/core/tilesheet.hpp b/src/nostalgia/modules/core/include/nostalgia/core/tilesheet.hpp
index a1012dc5..fc31a47a 100644
--- a/src/nostalgia/modules/core/include/nostalgia/core/tilesheet.hpp
+++ b/src/nostalgia/modules/core/include/nostalgia/core/tilesheet.hpp
@@ -302,6 +302,11 @@ struct CompactTileSheetV1 {
 	ox::Vector<uint8_t> pixels;
 };
 
+[[nodiscard]]
+constexpr bool valid(CompactTileSheetV1 const&ts) noexcept {
+	return ts.bpp == 4 || ts.bpp == 8;
+}
+
 using CompactTileSheet = CompactTileSheetV1;
 
 oxModelBegin(TileSheetV1)