diff --git a/src/slic3r/GUI/Auxiliary.cpp b/src/slic3r/GUI/Auxiliary.cpp
index 4deb621fd5d..7e0220a5da9 100644
--- a/src/slic3r/GUI/Auxiliary.cpp
+++ b/src/slic3r/GUI/Auxiliary.cpp
@@ -368,7 +368,7 @@ void AuFile::on_input_enter(wxCommandEvent &evt)
     auto     new_fullname = new_file_name + m_file_path.extension().string();
 
     
-    wxString new_fullname_path = dir.wstring() + "/" + new_fullname;
+    wxString new_fullname_path = wxString(dir.wstring()) + "/" + new_fullname;
     fs::path new_dir_path(new_fullname_path.ToStdWstring());
     
 
@@ -955,7 +955,7 @@ void AuxiliaryPanel::on_import_file(wxCommandEvent &event)
             }
             
             if (!is_exist) {
-                dir_path += "/" + src_bfs_path.filename().generic_wstring();
+                dir_path += wxString("/") + src_bfs_path.filename().generic_wstring();
             } else {
                 time_t t1 = time(0);
                 char   ch1[64];
@@ -965,7 +965,7 @@ void AuxiliaryPanel::on_import_file(wxCommandEvent &event)
                 wxString name = src_bfs_path.filename().generic_wstring();
                 auto before_name = replaceSpace(name.ToStdString(), src_bfs_path.extension().string(), "");
                 time_text = replaceSpace(time_text, ":", "_");
-                dir_path += "/" + before_name + "_" + time_text + src_bfs_path.extension().wstring();
+                dir_path += wxString("/") + before_name + "_" + time_text + src_bfs_path.extension().wstring();
             }
            
 
diff --git a/src/slic3r/GUI/AuxiliaryDataViewModel.cpp b/src/slic3r/GUI/AuxiliaryDataViewModel.cpp
index cad5cf5455d..4edfff8a94b 100644
--- a/src/slic3r/GUI/AuxiliaryDataViewModel.cpp
+++ b/src/slic3r/GUI/AuxiliaryDataViewModel.cpp
@@ -334,7 +334,7 @@ wxDataViewItemArray AuxiliaryModel::ImportFile(AuxiliaryModelNode* sel, wxArrayS
         wxString dir_path = m_root_dir;
         if (sel != m_root)
             dir_path += "\\" + sel->name;
-        dir_path += "\\" + src_bfs_path.filename().generic_wstring();
+        dir_path += wxString("\\") + src_bfs_path.filename().generic_wstring();
 
         boost::system::error_code ec;
         if (!fs::copy_file(src_bfs_path, fs::path(dir_path.ToStdWstring()), fs::copy_options::overwrite_existing, ec))