diff --git a/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-header.mustache b/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-header.mustache
index c5a91c0e1641..48859cf019e3 100644
--- a/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-header.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-header.mustache
@@ -28,18 +28,16 @@ namespace {{this}} {
 #include <variant>
 
 class {{declspec}} {{classname}}
-    : public {{{parent}}}{{^parent}}ModelBase{{/parent}}
 {
 public:
-    {{classname}}();
-    virtual ~{{classname}}();
+    {{classname}}() = default;
+    ~{{classname}}() = default;
 
     /////////////////////////////////////////////
-    /// ModelBase overrides
 
-    void validate() override;
+    void validate();
 
-    web::json::value toJson() const override;
+    web::json::value toJson() const;
 
     template<typename Target>
     bool fromJson(const web::json::value& json) {
@@ -53,7 +51,7 @@ public:
         return true;
     }
 
-    void toMultipart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& namePrefix) const override;
+    void toMultipart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& namePrefix) const;
 
     template<typename Target>
     bool fromMultiPart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& namePrefix) {
diff --git a/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-source.mustache b/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-source.mustache
index 4c3c1abbcfe7..49e9894da568 100644
--- a/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-source.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-source.mustache
@@ -7,6 +7,12 @@
 namespace {{this}} {
 {{/modelNamespaceDeclarations}}
 {{#oneOf}}{{#-first}}
+
+void {{classname}}::validate()
+{
+    // TODO: implement validation
+}
+
 const {{classname}}::VariantType& {{classname}}::getVariant() const
 {
     return m_variantValue;