diff --git a/src/libslic3r/utils.cpp b/src/libslic3r/utils.cpp
index c45150777..104d0c5ff 100644
--- a/src/libslic3r/utils.cpp
+++ b/src/libslic3r/utils.cpp
@@ -456,11 +456,13 @@ int copy_file(const std::string &from, const std::string &to, const bool with_ch
 
 int check_copy(const std::string &origin, const std::string &copy)
 {
-	std::ifstream f1(origin, std::ifstream::in | std::ifstream::binary | std::ifstream::ate);
-	std::ifstream f2(copy, std::ifstream::in | std::ifstream::binary | std::ifstream::ate);
+	boost::nowide::ifstream f1(origin, std::ifstream::in | std::ifstream::binary | std::ifstream::ate);
+	boost::nowide::ifstream f2(copy, std::ifstream::in | std::ifstream::binary | std::ifstream::ate);
 
-	if (f1.fail() || f2.fail())
-		return -2;
+	if (f1.fail())
+		return -4;
+	if (f2.fail())
+		return -5;
 
 	std::streampos fsize = f1.tellg();
 	if (fsize != f2.tellg())
diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index 548a19f77..53c3ec5ea 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -108,6 +108,16 @@ void BackgroundSlicingProcess::process_fff()
 				std::string err_msg = "Copying of the temporary G-code to the output G-code failed. There might be problem with target device, please try exporting again or using different device. The corrupted output G-code is at " + export_path + ".tmp.";
 				throw std::runtime_error(_utf8(L(err_msg)));
 			}
+			else if (with_check && copy_ret_val == -4)
+			{
+				std::string err_msg = "Copying of the temporary G-code has finnished but the original code at "+ m_temp_output_path +" couldn't be opened during copy check. The output G-code is at " + export_path + ".tmp.";
+				throw std::runtime_error(_utf8(L(err_msg)));
+			}
+			else if (with_check && copy_ret_val == -5)
+			{
+				std::string err_msg = "Copying of the temporary G-code has finnished but the exported code couldn't be opened during copy check. The output G-code is at " + export_path + ".tmp.";
+				throw std::runtime_error(_utf8(L(err_msg)));
+			}
 			else if (copy_ret_val == -3)
 			{
 				std::string err_msg = "Renaming of the G-code after copying to the selected destination folder has failed. Current path is " + export_path + ".tmp. Please try exporting again.";