diff --git a/src/Targets/TargetDescription/RegisterGroup.hpp b/src/Targets/TargetDescription/RegisterGroup.hpp
index 62a74c84..ca7bd661 100644
--- a/src/Targets/TargetDescription/RegisterGroup.hpp
+++ b/src/Targets/TargetDescription/RegisterGroup.hpp
@@ -64,7 +64,7 @@ namespace Targets::TargetDescription
             return this->tryGetSubgroup(Services::StringService::split(keyStr, '.'));
         }
 
-        std::optional<std::reference_wrapper<const RegisterGroup>> getSubgroup(std::string_view keyStr) const {
+        const RegisterGroup& getSubgroup(std::string_view keyStr) const {
             const auto subgroup = this->tryGetSubgroup(keyStr);
             if (!subgroup.has_value()) {
                 throw Exceptions::InvalidTargetDescriptionDataException(