diff --git a/core-writer/test/test_H5WriteModule.cpp b/core-writer/test/test_H5WriteModule.cpp
index cbe7ba2..84a30f4 100644
--- a/core-writer/test/test_H5WriteModule.cpp
+++ b/core-writer/test/test_H5WriteModule.cpp
@@ -20,7 +20,7 @@ void generate_frames(RingBuffer& ring_buffer, int n_frames)
 
         FrameMetadata metadata = {
                 0, // size_t buffer_slot_index;
-                0, // size_t frame_bytes_size;
+                image_n_bytes, // size_t frame_bytes_size;
                 static_cast<uint64_t>(i_frame), // uint64_t frame_index;
                 "little", // std::string endianness;
                 "uint16", //std::string type;