diff --git a/core-buffer/include/formats.hpp b/core-buffer/include/formats.hpp
index 31d88d0..e1083ff 100644
--- a/core-buffer/include/formats.hpp
+++ b/core-buffer/include/formats.hpp
@@ -13,4 +13,14 @@ struct ImageMetadataBuffer
     uint16_t n_images;
 };
 
+#pragma pack(push)
+#pragma pack(1)
+struct ReplayBuffer
+{
+    ModuleFrame metadata[core_buffer::REPLAY_READ_BUFFER_SIZE];
+    uint64_t start_pulse_id;
+    uint16_t n_frames;
+};
+#pragma pack(pop)
+
 #endif //SF_DAQ_BUFFER_FORMATS_HPP
diff --git a/core-buffer/src/FastQueue.cpp b/core-buffer/src/FastQueue.cpp
index d9dcb39..1595278 100644
--- a/core-buffer/src/FastQueue.cpp
+++ b/core-buffer/src/FastQueue.cpp
@@ -104,5 +104,6 @@ void FastQueue<T>::release()
 }
 
 template class FastQueue<ImageMetadataBuffer>;
+template class FastQueue<ReplayBuffer>;
 template class FastQueue<ModuleFrame>;
 template class FastQueue<ModuleFrameBuffer>;