diff --git a/include/xrpl/protocol/Issue.h b/include/xrpl/protocol/Issue.h
index 60182698ee6..83ef337c357 100644
--- a/include/xrpl/protocol/Issue.h
+++ b/include/xrpl/protocol/Issue.h
@@ -58,6 +58,9 @@ class Issue
 
     bool
     native() const;
+
+    friend constexpr std::weak_ordering
+    operator<=>(Issue const& lhs, Issue const& rhs);
 };
 
 bool
@@ -95,7 +98,7 @@ operator==(Issue const& lhs, Issue const& rhs)
 
 /** Strict weak ordering. */
 /** @{ */
-[[nodiscard]] inline constexpr std::weak_ordering
+[[nodiscard]] constexpr std::weak_ordering
 operator<=>(Issue const& lhs, Issue const& rhs)
 {
     if (auto const c{lhs.currency <=> rhs.currency}; c != 0)
diff --git a/include/xrpl/protocol/MPTIssue.h b/include/xrpl/protocol/MPTIssue.h
index 46f28dd87e1..028051ab1ae 100644
--- a/include/xrpl/protocol/MPTIssue.h
+++ b/include/xrpl/protocol/MPTIssue.h
@@ -51,8 +51,11 @@ class MPTIssue
     void
     setJson(Json::Value& jv) const;
 
-    auto
-    operator<=>(MPTIssue const&) const = default;
+    friend constexpr bool
+    operator==(MPTIssue const& lhs, MPTIssue const& rhs);
+
+    friend constexpr std::weak_ordering
+    operator<=>(MPTIssue const& lhs, MPTIssue const& rhs);
 
     bool
     native() const
@@ -61,6 +64,18 @@ class MPTIssue
     }
 };
 
+constexpr bool
+operator==(MPTIssue const& lhs, MPTIssue const& rhs)
+{
+    return lhs.mptID_ == rhs.mptID_;
+}
+
+constexpr std::weak_ordering
+operator<=>(MPTIssue const& lhs, MPTIssue const& rhs)
+{
+    return lhs.mptID_ <=> rhs.mptID_;
+}
+
 /** MPT is a non-native token.
  */
 inline bool