diff --git a/plugins/3MFReader/ThreeMFReader.py b/plugins/3MFReader/ThreeMFReader.py
index 09ed1e126d..1726818100 100755
--- a/plugins/3MFReader/ThreeMFReader.py
+++ b/plugins/3MFReader/ThreeMFReader.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2015 Ultimaker B.V.
+# Copyright (c) 2018 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 
 import os.path
@@ -37,10 +37,6 @@ class ThreeMFReader(MeshReader):
         super().__init__()
         self._supported_extensions = [".3mf"]
         self._root = None
-        self._namespaces = {
-            "3mf": "http://schemas.microsoft.com/3dmanufacturing/core/2015/02",
-            "cura": "http://software.ultimaker.com/xml/cura/3mf/2015/10"
-        }
         self._base_name = ""
         self._unit = None
         self._object_count = 0  # Used to name objects as there is no node name yet.