diff --git a/include/cppgc/heap.h b/include/cppgc/heap.h
index 02ee12eaba..4a454300bc 100644
--- a/include/cppgc/heap.h
+++ b/include/cppgc/heap.h
@@ -112,6 +112,10 @@ class V8_EXPORT Heap {
    * heap through `Heap::Create()`.
    */
   struct HeapOptions {
+    HeapOptions() = default;
+    HeapOptions(HeapOptions&&) = default;
+    HeapOptions(const HeapOptions&) = delete;
+
     /**
      * Creates reasonable defaults for instantiating a Heap.
      *
diff --git a/include/v8-cppgc.h b/include/v8-cppgc.h
index f96709c783..0f18de2b12 100644
--- a/include/v8-cppgc.h
+++ b/include/v8-cppgc.h
@@ -77,6 +77,11 @@ struct WrapperDescriptor final {
 };
 
 struct V8_EXPORT CppHeapCreateParams {
+  CppHeapCreateParams() = default;
+  CppHeapCreateParams(const CppHeapCreateParams&) = delete;
+  CppHeapCreateParams(CppHeapCreateParams&&) = default;
+  CppHeapCreateParams &operator = (const CppHeapCreateParams&) = delete;
+
   std::vector<std::unique_ptr<cppgc::CustomSpaceBase>> custom_spaces;
   WrapperDescriptor wrapper_descriptor;
   /**