diff --git a/spinnman/processes/get_machine_process.py b/spinnman/processes/get_machine_process.py
index fd8a33f5f..03920c2f9 100644
--- a/spinnman/processes/get_machine_process.py
+++ b/spinnman/processes/get_machine_process.py
@@ -93,6 +93,7 @@ def __init__(self, connection_selector: ConnectionSelector):
         # Maps between virtual and physical cores
         self._virtual_to_physical_map: Dict[XY, bytes] = dict()
         self._physical_to_virtual_map: Dict[XY, bytes] = dict()
+        self._progress: ProgressBar = None
 
     def _make_chip(self, chip_info: ChipSummaryInfo, machine: Machine) -> Chip:
         """