--- a/src/slic3r/GUI/Gizmos/GLGizmoSVG.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSVG.cpp
@@ -1595,7 +1595,7 @@ void GLGizmoSVG::draw_filename(){
             if (dlg.ShowModal() == wxID_OK ){
                 last_used_directory = dlg.GetDirectory();
                 std::string out_path_str(into_u8(dlg.GetPath()));
-                boost::nowide::ofstream stream(out_path_str);
+                std::ofstream stream(out_path_str);
                 if (stream.is_open()){
                     stream << *svg.file_data;
 
--- a/src/slic3r/GUI/PresetArchiveDatabase.cpp
+++ b/src/slic3r/GUI/PresetArchiveDatabase.cpp
@@ -515,7 +515,7 @@ void PresetArchiveDatabase::load_app_manifest_json()
 	if (!fs::exists(path, ec) || ec) {
 		copy_initial_manifest();
 	}
-	boost::nowide::ifstream file(path.string());
+	std::ifstream file(path.string());
 	std::string data;
 	if (file.is_open()) {
 		std::string line;
@@ -682,7 +682,7 @@ void PresetArchiveDatabase::save_app_manifest_json() const
 	data += "]";
 
 	std::string path = get_stored_manifest_path().string();
-	boost::nowide::ofstream file(path);
+	std::ofstream file(path);
 	if (file.is_open()) {
 		file << data;
 		file.close();
--- a/src/slic3r/Utils/Http.cpp
+++ b/src/slic3r/Utils/Http.cpp
@@ -302,7 +302,7 @@ void Http::priv::form_add_file(const char *name, const fs::path &path, const cha
 //FIXME may throw! Is the caller aware of it?
 void Http::priv::set_post_body(const fs::path &path)
 {
-	boost::nowide::ifstream file(path.string());
+	std::ifstream file(path.string());
 	std::string file_content { std::istreambuf_iterator<char>(file), std::istreambuf_iterator<char>() };
 	postfields = std::move(file_content);
 }