diff --git a/src/ripple/protocol/Book.h b/src/ripple/protocol/Book.h
index fd3093d9877..609989062c0 100644
--- a/src/ripple/protocol/Book.h
+++ b/src/ripple/protocol/Book.h
@@ -79,7 +79,7 @@ operator==(Book const& lhs, Book const& rhs)
 [[nodiscard]] inline constexpr std::weak_ordering
 operator<=>(Book const& lhs, Book const& rhs)
 {
-    if (auto const c{lhs.in <=> rhs.in}; c != std::weak_ordering::equivalent)
+    if (auto const c{lhs.in <=> rhs.in}; c != 0)
         return c;
     return lhs.out <=> rhs.out;
 }