diff --git a/gplugins/tidy3d/get_simulation_grating_coupler.py b/gplugins/tidy3d/get_simulation_grating_coupler.py
index 69cb4654..da95cf87 100644
--- a/gplugins/tidy3d/get_simulation_grating_coupler.py
+++ b/gplugins/tidy3d/get_simulation_grating_coupler.py
@@ -271,9 +271,11 @@ def get_simulation_grating_coupler(
     )
 
     component_padding = layer_stack.get_component_with_derived_layers(
-        component, decorator=add_padding_custom
+        component,
     )
 
+    component_padding = add_padding_custom(component_padding)
+
     component_extended = (
         gf.components.extend_ports(
             component=component_padding,