diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index 5787b6e17d..7fa5d5382c 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -1196,8 +1196,8 @@ void GCodeProcessor::process_binary_file(const std::string& filename, std::funct
 #if ENABLE_BINARIZED_GCODE_DEBUG
         if (thumbnail_block.data.size() > 0) {
             auto format_filename = [](const std::string& stem, const bgcode::binarize::ThumbnailBlock& block) {
-                std::string ret = stem + "_" + std::to_string(block.width) + "x" + std::to_string(block.height);
-                switch ((bgcode::core::EThumbnailFormat)block.format)
+                std::string ret = stem + "_" + std::to_string(block.params.width) + "x" + std::to_string(block.params.height);
+                switch ((bgcode::core::EThumbnailFormat)block.params.format)
                 {
                 case bgcode::core::EThumbnailFormat::PNG: { ret += ".png"; break; }
                 case bgcode::core::EThumbnailFormat::JPG: { ret += ".jpg"; break; }
diff --git a/src/libslic3r/GCode/Thumbnails.hpp b/src/libslic3r/GCode/Thumbnails.hpp
index 4bd6637879..c430d695c2 100644
--- a/src/libslic3r/GCode/Thumbnails.hpp
+++ b/src/libslic3r/GCode/Thumbnails.hpp
@@ -72,12 +72,12 @@ inline void generate_binary_thumbnails(ThumbnailsGeneratorCallback& thumbnail_cb
                 auto compressed = compress_thumbnail(data, format);
                 if (compressed->data != nullptr && compressed->size > 0) {
                     bgcode::binarize::ThumbnailBlock& block = out_thumbnails.emplace_back(bgcode::binarize::ThumbnailBlock());
-                    block.width = (uint16_t)data.width;
-                    block.height = (uint16_t)data.height;
+                    block.params.width = (uint16_t)data.width;
+                    block.params.height = (uint16_t)data.height;
                     switch (format) {
-                    case GCodeThumbnailsFormat::PNG: { block.format = (uint16_t)bgcode::core::EThumbnailFormat::PNG; break; }
-                    case GCodeThumbnailsFormat::JPG: { block.format = (uint16_t)bgcode::core::EThumbnailFormat::JPG; break; }
-                    case GCodeThumbnailsFormat::QOI: { block.format = (uint16_t)bgcode::core::EThumbnailFormat::QOI; break; }
+                    case GCodeThumbnailsFormat::PNG: { block.params.format = (uint16_t)bgcode::core::EThumbnailFormat::PNG; break; }
+                    case GCodeThumbnailsFormat::JPG: { block.params.format = (uint16_t)bgcode::core::EThumbnailFormat::JPG; break; }
+                    case GCodeThumbnailsFormat::QOI: { block.params.format = (uint16_t)bgcode::core::EThumbnailFormat::QOI; break; }
                     }
                     block.data.resize(compressed->size);
                     memcpy(block.data.data(), compressed->data, compressed->size);