diff --git a/docraft/include/docraft/craft/docraft_craft_language_parser.h b/docraft/include/docraft/craft/docraft_craft_language_parser.h
index cbdfb2b..08b0771 100644
--- a/docraft/include/docraft/craft/docraft_craft_language_parser.h
+++ b/docraft/include/docraft/craft/docraft_craft_language_parser.h
@@ -49,6 +49,9 @@ namespace docraft::craft {
 
         ~DocraftCraftLanguageParser() = default;
 
+        DocraftCraftLanguageParser(const DocraftCraftLanguageParser&) = delete;
+        DocraftCraftLanguageParser& operator=(const DocraftCraftLanguageParser&) = delete;
+
         /**
          * @brief Parses craft language source (a single root element) as a string.
          * @param craft_language_source XML source as string.
diff --git a/docraft/include/docraft/loom/craft/docraft_loom_tag_handler_registry.h b/docraft/include/docraft/loom/craft/docraft_loom_tag_handler_registry.h
index 186db06..d4f9eaf 100644
--- a/docraft/include/docraft/loom/craft/docraft_loom_tag_handler_registry.h
+++ b/docraft/include/docraft/loom/craft/docraft_loom_tag_handler_registry.h
@@ -37,6 +37,9 @@ namespace docraft::loom::craft {
     public:
         static DocraftLoomTagHandlerRegistry& instance();
 
+        DocraftLoomTagHandlerRegistry(const DocraftLoomTagHandlerRegistry&) = delete;
+        DocraftLoomTagHandlerRegistry& operator=(const DocraftLoomTagHandlerRegistry&) = delete;
+
         void register_handler(const std::string& tag, std::unique_ptr<IDocraftLoomTagHandler> handler);
 
         /**