diff --git a/include/sharg/parser.hpp b/include/sharg/parser.hpp
index f3be89d3..b0af44a7 100644
--- a/include/sharg/parser.hpp
+++ b/include/sharg/parser.hpp
@@ -740,6 +740,7 @@ class parser
     //!\brief List of option/flag identifiers that are already used.
     std::unordered_set<detail::id_pair> used_option_ids{{'h', "help"},
                                                         {'\0' /*hh*/, "advanced-help"},
+                                                        {'\0', "hh"},
                                                         {'\0', "export-help"},
                                                         {'\0', "version"},
                                                         {'\0', "copyright"}};
diff --git a/test/unit/parser/parser_design_error_test.cpp b/test/unit/parser/parser_design_error_test.cpp
index 895597c4..9e56aa9a 100644
--- a/test/unit/parser/parser_design_error_test.cpp
+++ b/test/unit/parser/parser_design_error_test.cpp
@@ -72,8 +72,11 @@ TEST_F(verify_option_config_test, special_identifiers)
     auto parser = get_parser();
     EXPECT_THROW(parser.add_option(option_value, sharg::config{.short_id = 'h'}), sharg::design_error);
     EXPECT_THROW(parser.add_option(option_value, sharg::config{.long_id = "help"}), sharg::design_error);
+    EXPECT_THROW(parser.add_option(option_value, sharg::config{.long_id = "hh"}), sharg::design_error);
     EXPECT_THROW(parser.add_option(option_value, sharg::config{.long_id = "advanced-help"}), sharg::design_error);
     EXPECT_THROW(parser.add_option(option_value, sharg::config{.long_id = "export-help"}), sharg::design_error);
+    EXPECT_THROW(parser.add_option(option_value, sharg::config{.long_id = "version"}), sharg::design_error);
+    EXPECT_THROW(parser.add_option(option_value, sharg::config{.long_id = "copyright"}), sharg::design_error);
 }
 
 TEST_F(verify_option_config_test, single_character_long_id)