diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 63a697595..a08660e54 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -561,7 +561,7 @@ sub export_stl {
         $output_file = $print->expanded_output_filepath($output_file);
         $output_file =~ s/\.gcode$/.stl/i;
         my $dlg = Wx::FileDialog->new($self, 'Save STL file as:', dirname($output_file),
-            basename($output_file), $Slic3r::GUI::SkeinPanel::model_wildcard, wxFD_SAVE);
+            basename($output_file), $Slic3r::GUI::SkeinPanel::model_wildcard, wxFD_SAVE | &Wx::wxFD_OVERWRITE_PROMPT);
         if ($dlg->ShowModal != wxID_OK) {
             $dlg->Destroy;
             return;
diff --git a/lib/Slic3r/GUI/SkeinPanel.pm b/lib/Slic3r/GUI/SkeinPanel.pm
index f695acca7..a04740f95 100644
--- a/lib/Slic3r/GUI/SkeinPanel.pm
+++ b/lib/Slic3r/GUI/SkeinPanel.pm
@@ -294,7 +294,7 @@ sub save_config {
     my $dir = $last_config ? dirname($last_config) : $last_config_dir || $last_skein_dir || "";
     my $filename = $last_config ? basename($last_config) : "config.ini";
     my $dlg = Wx::FileDialog->new($self, 'Save configuration as:', $dir, $filename, 
-        $ini_wildcard, wxFD_SAVE);
+        $ini_wildcard, wxFD_SAVE | &Wx::wxFD_OVERWRITE_PROMPT);
     if ($dlg->ShowModal == wxID_OK) {
         my $file = $dlg->GetPath;
         $last_config_dir = dirname($file);