diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index c4c3ea544..e01fd060f 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -471,6 +471,7 @@ sub update_presets {
 sub filament_presets {
     my $self = shift;
     
+    # force scalar context for GetSelection() as it's context-aware
     return map scalar($_->GetSelection), @{ $self->{preset_choosers}{filament} };
 }