diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index b27a3e0cf..508e0450c 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -8,6 +8,7 @@ use utf8;
 use File::Basename qw(basename dirname);
 use List::Util qw(sum first max);
 use Slic3r::Geometry qw(X Y Z MIN MAX scale unscale deg2rad);
+use LWP::UserAgent;
 use threads::shared qw(shared_clone);
 use Wx qw(:button :cursor :dialog :filedialog :keycode :icon :font :id :listctrl :misc 
     :panel :sizer :toolbar :window wxTheApp :notebook :combobox);