diff --git a/source/mijin/util/bitflags.hpp b/source/mijin/util/bitflags.hpp
index dd676d0..7c5f41d 100644
--- a/source/mijin/util/bitflags.hpp
+++ b/source/mijin/util/bitflags.hpp
@@ -80,6 +80,8 @@ struct BitFlags
     constexpr bool operator!() const {
         return !static_cast<bool>(*this);
     }
+
+    auto operator<=>(const BitFlags&) const noexcept = default;
 private:
     constexpr TBits* asBits() { return static_cast<TBits*>(this); }
     constexpr const TBits* asBits() const { return static_cast<const TBits*>(this); }