diff --git a/include/rfl/OneOf.hpp b/include/rfl/OneOf.hpp
index d1fbb435..bad32d28 100644
--- a/include/rfl/OneOf.hpp
+++ b/include/rfl/OneOf.hpp
@@ -43,7 +43,7 @@ struct OneOf {
   static rfl::Result<T> validate_impl(const T& _value,
                                       std::vector<Error> _errors) {
     return Head::validate(_value)
-        .and_then([&](auto&& _result) -> rfl::Result<T> {
+        .and_then([&](auto&& /*_result*/) -> rfl::Result<T> {
           if constexpr (sizeof...(Tail) == 0) {
             if (_errors.size() == sizeof...(Cs)) {
               return _value;
diff --git a/include/rfl/parsing/FieldVariantParser.hpp b/include/rfl/parsing/FieldVariantParser.hpp
index ffd6a4dd..8f6eab80 100644
--- a/include/rfl/parsing/FieldVariantParser.hpp
+++ b/include/rfl/parsing/FieldVariantParser.hpp
@@ -72,8 +72,8 @@ struct FieldVariantParser {
   }
 
   static schema::Type to_schema(
-      std::map<std::string, schema::Type>* _definitions,
-      std::vector<schema::Type> _types = {}) {
+      std::map<std::string, schema::Type>* /*_definitions*/,
+      std::vector<schema::Type> /*_types = {}*/) {
     using VariantType = rfl::Variant<NamedTuple<FieldTypes>...>;
     return Parser<R, W, VariantType, ProcessorsType>::to_schema(_definitions);
   }
diff --git a/include/rfl/parsing/Parser_bytestring.hpp b/include/rfl/parsing/Parser_bytestring.hpp
index 75e9b9fb..1154c02f 100644
--- a/include/rfl/parsing/Parser_bytestring.hpp
+++ b/include/rfl/parsing/Parser_bytestring.hpp
@@ -28,7 +28,7 @@ struct Parser<R, W, Bytestring, ProcessorsType> {
   }
 
   static schema::Type to_schema(
-      std::map<std::string, schema::Type>* _definitions) {
+      std::map<std::string, schema::Type>* /*_definitions*/) {
     return schema::Type{schema::Type::Bytestring{}};
   }
 };
diff --git a/include/rfl/parsing/Parser_vectorstring.hpp b/include/rfl/parsing/Parser_vectorstring.hpp
index c64a8199..00d681da 100644
--- a/include/rfl/parsing/Parser_vectorstring.hpp
+++ b/include/rfl/parsing/Parser_vectorstring.hpp
@@ -28,7 +28,7 @@ struct Parser<R, W, Vectorstring, ProcessorsType> {
   }
 
   static schema::Type to_schema(
-      std::map<std::string, schema::Type>* _definitions) {
+      std::map<std::string, schema::Type>* /*_definitions*/) {
     return schema::Type{schema::Type::Vectorstring{}};
   }
 };