diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 3746ca80f70..b54a50ca7a2 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -167,7 +167,7 @@ sub new {
         $self->{htoolbar}->AddTool(TB_CUT, "Cut…", Wx::Bitmap->new($Slic3r::var->("package.png"), wxBITMAP_TYPE_PNG), '');
         $self->{htoolbar}->AddSeparator;
         $self->{htoolbar}->AddTool(TB_SETTINGS, "Settings…", Wx::Bitmap->new($Slic3r::var->("cog.png"), wxBITMAP_TYPE_PNG), '');
-        $self->{htoolbar}->AddTool(TB_LAYER_EDITING, 'Layer Editing', Wx::Bitmap->new($Slic3r::var->("variable_layer_height.png"), wxBITMAP_TYPE_PNG), wxNullBitmap, 1, undef, 'Layer Editing');
+        $self->{htoolbar}->AddTool(TB_LAYER_EDITING, 'Layer Editing', Wx::Bitmap->new($Slic3r::var->("variable_layer_height.png"), wxBITMAP_TYPE_PNG), wxNullBitmap, 1, 0, 'Layer Editing');
     } else {
         my %tbar_buttons = (
             add             => "Add…",