diff --git a/src/ruc/format/formatter.h b/src/ruc/format/formatter.h
index 3ef3c00..d7eb425 100644
--- a/src/ruc/format/formatter.h
+++ b/src/ruc/format/formatter.h
@@ -314,8 +314,6 @@ struct Formatter<Specifier> : Formatter<std::nullptr_t> {
 
 } // namespace ruc::format
 
-using ruc::format::Formatter;
-
 #if 0
 
 TODO:
diff --git a/src/ruc/format/parser.cpp b/src/ruc/format/parser.cpp
index a5106bd..0cadc55 100644
--- a/src/ruc/format/parser.cpp
+++ b/src/ruc/format/parser.cpp
@@ -411,6 +411,8 @@ constexpr void Parser::checkSpecifierType(const Specifier& specifier, ParameterT
 	case ParameterType::Container:
 		checkSpecifierContainerType(specifier);
 		break;
+	case ParameterType::UserDefined:
+		break;
 	default:
 		VERIFY_NOT_REACHED();
 	}
diff --git a/src/ruc/format/parser.h b/src/ruc/format/parser.h
index cf9de20..97d27d1 100644
--- a/src/ruc/format/parser.h
+++ b/src/ruc/format/parser.h
@@ -32,6 +32,7 @@ public:
 		String,
 		Pointer,
 		Container,
+		UserDefined,
 	};
 
 	Parser(std::string_view format, size_t parameterCount);
diff --git a/test/unit/testutilformat.cpp b/test/unit/testutilformat.cpp
index ab4ad9d..2455fc4 100644
--- a/test/unit/testutilformat.cpp
+++ b/test/unit/testutilformat.cpp
@@ -513,5 +513,5 @@ TEST_CASE(FormatContainers)
 }
 
 // Local Variables:
-// lsp-in-cpp-project-cache: nil
+// lsp-in-cpp-project-cache: (nil)
 // End: