diff --git a/src/blenderbim/blenderbim/bim/module/model/wall.py b/src/blenderbim/blenderbim/bim/module/model/wall.py
index 09836c0d33..a10dce6b4c 100644
--- a/src/blenderbim/blenderbim/bim/module/model/wall.py
+++ b/src/blenderbim/blenderbim/bim/module/model/wall.py
@@ -589,7 +589,7 @@ class DumbWallGenerator:
         matrix_world = Matrix.Rotation(self.rotation, 4, "Z")
         matrix_world.translation = self.location
         if self.collection_obj and self.collection_obj.BIMObjectProperties.ifc_definition_id:
-            matrix_world.location.z = self.collection_obj.location.z + props.rl1
+            matrix_world.translation.z = self.collection_obj.location.z + props.rl1
         obj.matrix_world = matrix_world
         bpy.context.view_layer.update()
         self.collection.objects.link(obj)