diff --git a/src/pyg4ometry/geant4/LogicalVolume.py b/src/pyg4ometry/geant4/LogicalVolume.py
index 9b9c72ec1..df229a2fc 100644
--- a/src/pyg4ometry/geant4/LogicalVolume.py
+++ b/src/pyg4ometry/geant4/LogicalVolume.py
@@ -79,7 +79,8 @@ def __init__(self, solid, material, name, registry=None, addRegistry=True, **kwa
 
         if isinstance(material, _mat.Material):
             self.material = material
-            self.material.set_registry(registry, dontWarnIfAlreadyAdded=True)
+            if registry and addRegistry:
+                self.material.set_registry(registry, dontWarnIfAlreadyAdded=True)
         elif isinstance(material, str):
             # If the material is registered already, use it
             if registry and material in registry.materialDict: