diff --git a/src/ipa/raspberrypi/controller/metadata.hpp b/src/ipa/raspberrypi/controller/metadata.hpp
index 3a97a5f5..fd6aac88 100644
--- a/src/ipa/raspberrypi/controller/metadata.hpp
+++ b/src/ipa/raspberrypi/controller/metadata.hpp
@@ -73,6 +73,12 @@ public:
 		return *this;
 	}
 
+	void Merge(Metadata &other)
+	{
+		std::scoped_lock lock(mutex_, other.mutex_);
+		data_.merge(other.data_);
+	}
+
 	template<typename T>
 	T *GetLocked(std::string const &tag)
 	{