diff --git a/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm b/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
index 2fb3280b0..98890b6f6 100644
--- a/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
+++ b/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
@@ -428,6 +428,7 @@ sub _update {
         $self->{last_coords}{z} = $m_z;
     }
 
+    $self->{parts_changed} = 1;
     my @objects = ();
     push @objects, $self->{model_object};
     $self->{canvas}->reset_objects;