diff --git a/src/libslic3r/PrintApply.cpp b/src/libslic3r/PrintApply.cpp
index d399e9d53d..da73f2bc68 100644
--- a/src/libslic3r/PrintApply.cpp
+++ b/src/libslic3r/PrintApply.cpp
@@ -1163,8 +1163,9 @@ Print::ApplyStatus Print::apply(const Model &model, DynamicPrintConfig new_full_
 
             update_apply_status(
                 (num_extruders_changed || tool_change_differ || multi_extruder_differ || color_change_differ) ?
-            	// The Tool Ordering and the Wipe Tower are no more valid.
-            	this->invalidate_steps({ psWipeTower, psGCodeExport }) :
+                // The Tool Ordering and the Wipe Tower are no more valid.
+                // Because G-code export (PlaceholderParser) accesses the first layer convex hull, we need to also invalidate psSkirtBrim.
+            	this->invalidate_steps({ psWipeTower, psGCodeExport, psSkirtBrim }) :
             	// There is no change in Tool Changes stored in custom_gcode_per_print_z, therefore there is no need to update Tool Ordering.
             	this->invalidate_step(psGCodeExport));
             m_model.custom_gcode_per_print_z() = model.custom_gcode_per_print_z();