diff --git a/src/slic3r/Utils/Http.cpp b/src/slic3r/Utils/Http.cpp
index 11a36dfabc..77a44e699b 100644
--- a/src/slic3r/Utils/Http.cpp
+++ b/src/slic3r/Utils/Http.cpp
@@ -88,9 +88,13 @@ std::mutex g_mutex;
 
 struct form_file
 {
-    fs::ifstream ifs;
+    fs::ifstream                          ifs;
     boost::filesystem::ifstream::off_type init_offset;
     size_t                                content_length;
+
+    form_file(fs::path const& p, const boost::filesystem::ifstream::off_type offset, const size_t content_length)
+        : ifs(p, std::ios::in | std::ios::binary), init_offset(offset), content_length(content_length)
+    {}
 };
 
 struct Http::priv
@@ -314,7 +318,7 @@ void Http::priv::form_add_file(const char *name, const fs::path &path, const cha
 		filename = path.string().c_str();
 	}
 
-	form_files.emplace_back(form_file{{path, std::ios::in | std::ios::binary}, offset, length});
+	form_files.emplace_back(path, offset, length);
 	auto &f = form_files.back();
     size_t size = length;
     if (length == 0) {
@@ -381,7 +385,7 @@ void Http::priv::set_put_body(const fs::path &path)
 	boost::system::error_code ec;
 	boost::uintmax_t filesize = file_size(path, ec);
 	if (!ec) {
-        putFile = std::make_unique<form_file>(form_file{{path, std::ios_base::binary | std::ios_base::in}, 0, 0});
+        putFile = std::make_unique<form_file>(path, 0, 0);
 		::curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
 		::curl_easy_setopt(curl, CURLOPT_READDATA, (void *) (putFile.get()));
 		::curl_easy_setopt(curl, CURLOPT_INFILESIZE, filesize);