diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index 5fbaa8f036..91ec184b80 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -1054,7 +1054,7 @@ void GCodeProcessor::process_file(const std::string& filename, std::function<voi
         throw Slic3r::RuntimeError(format("Error opening file %1%", filename));
 
     using namespace bgcode::core;
-    std::vector<uint8_t> cs_buffer(65536);
+    std::vector<std::byte> cs_buffer(65536);
     const bool is_binary = is_valid_binary_gcode(*file, true, cs_buffer.data(), cs_buffer.size()) == EResult::Success;
     fclose(file);
 
@@ -1168,7 +1168,7 @@ void GCodeProcessor::process_binary_file(const std::string& filename, std::funct
 
     // read file metadata block, if present
     BlockHeader block_header;
-    std::vector<uint8_t> cs_buffer(65536);
+    std::vector<std::byte> cs_buffer(65536);
     res = read_next_block_header(*file.f, file_header, block_header, cs_buffer.data(), cs_buffer.size());
     if (res != EResult::Success)
         throw Slic3r::RuntimeError(format("Error reading file %1%: %2%", filename, std::string(translate_result(res))));
diff --git a/src/libslic3r/PresetBundle.cpp b/src/libslic3r/PresetBundle.cpp
index 2f425248a1..684558fff4 100644
--- a/src/libslic3r/PresetBundle.cpp
+++ b/src/libslic3r/PresetBundle.cpp
@@ -894,7 +894,7 @@ ConfigSubstitutions PresetBundle::load_config_file(const std::string &path, Forw
         FILE* file = boost::nowide::fopen(path.c_str(), "rb");
         if (file == nullptr)
             throw Slic3r::RuntimeError(format("Error opening file %1%", path));
-        std::vector<uint8_t> cs_buffer(65536);
+        std::vector<std::byte> cs_buffer(65536);
         const bool is_binary = bgcode::core::is_valid_binary_gcode(*file, true, cs_buffer.data(), cs_buffer.size()) == bgcode::core::EResult::Success;
         fclose(file);