diff --git a/src/wireviz/Harness.py b/src/wireviz/Harness.py
index feb312f..dcb4efd 100644
--- a/src/wireviz/Harness.py
+++ b/src/wireviz/Harness.py
@@ -9,6 +9,7 @@ from graphviz import Graph
 
 import wireviz.wv_colors
 from wireviz.DataClasses import (
+    AUTOGENERATED_PREFIX,
     AdditionalComponent,
     Arrow,
     ArrowWeight,
@@ -98,10 +99,10 @@ class Harness:
                 bom_entry["designators"] = set()
             # update fields
             bom_entry["qty"] += qty
-            if designator:
+            if designator and not designator.startswith(AUTOGENERATED_PREFIX):
                 if isinstance(designator, str):
                     bom_entry["designators"].add(designator)
-                else:
+                else:  # list
                     bom_entry["designators"].update(designator)
             bom_entry["category"] = category