diff --git a/implementation/class.h b/implementation/class.h
index 81dee205..18a52196 100644
--- a/implementation/class.h
+++ b/implementation/class.h
@@ -36,7 +36,10 @@ namespace jni {
 
 template <typename Extends_, typename Constructors_, typename Static_,
           typename Methods_, typename Fields_>
-struct Class {};
+struct Class {
+  constexpr Class() = default;
+  constexpr Class(const char* name) {}
+};
 
 template <typename Extends_, typename... Constructors_,
           typename... StaticMethods_, typename... StaticFields_,
@@ -70,6 +73,14 @@ struct Class<Extends_, std::tuple<Constructors_...>,
   // provided where they are and aren't present.
   ////////////////////////////////////////////////////////////////////////////////
 
+  // To stifle a test failure.
+  constexpr Class()
+      : Object("__JNI_BIND__NO_CLASS__"),
+        constructors_(Constructor<>{}),
+        static_(),
+        methods_(),
+        fields_() {}
+
   // Methods + Fields.
   explicit constexpr Class(const char* class_name, Methods_... methods,
                            Fields_... fields)
diff --git a/implementation/return.h b/implementation/return.h
index 8f352be3..7b6e8f57 100644
--- a/implementation/return.h
+++ b/implementation/return.h
@@ -31,7 +31,7 @@ struct Return : ReturnBase {
 
   using Raw = Raw_;
 
-  constexpr Return() = default;
+  constexpr Return() {}
 
   template <typename Raw>
   constexpr explicit Return(Raw raw) : raw_(raw) {}
@@ -42,7 +42,7 @@ struct Return<void> : ReturnBase {
   using Raw = void;
   const Void raw_{};
 
-  constexpr Return() = default;
+  constexpr Return() {}
 };
 
 Return() -> Return<void>;
diff --git a/metaprogramming/string_literal.h b/metaprogramming/string_literal.h
index e93a4b85..b6b88ab1 100644
--- a/metaprogramming/string_literal.h
+++ b/metaprogramming/string_literal.h
@@ -58,9 +58,9 @@ struct StringLiteral {
 template <size_t N>
 StringLiteral(const char (&str)[N]) -> StringLiteral<N>;
 
+}  // namespace jni::metaprogramming
+
 #endif  // __cplusplus >= 202002L
 #endif  // __cplusplus
 
-}  // namespace jni::metaprogramming
-
 #endif  // JNI_BIND_METAPROGRAMMING_STRING_LITERAL_H_