diff --git a/src/wireviz/Harness.py b/src/wireviz/Harness.py
index af6d7761..b1add9bf 100644
--- a/src/wireviz/Harness.py
+++ b/src/wireviz/Harness.py
@@ -214,7 +214,7 @@ def create_graph(self) -> Graph:
                 if colorstr:
                     wireinfo.append(colorstr)
                 if cable.wirelabels:
-                    wireinfo.append(wirelabel if wirelabel else '')
+                    wireinfo.append(wirelabel if wirelabel is not None else '')
                 wirehtml.append(f'     {":".join(wireinfo)}')
 
                 wirehtml.append(f'    </td>')