diff --git a/spinnman/messages/sdp/sdp_header.py b/spinnman/messages/sdp/sdp_header.py
index 370e1ab81..538855a63 100644
--- a/spinnman/messages/sdp/sdp_header.py
+++ b/spinnman/messages/sdp/sdp_header.py
@@ -331,7 +331,7 @@ def get_physical_cpu_id(self) -> str:
         :rtype: str
         """
         return SpiNNManDataView.get_physical_core_string(
-            self._destination_chip_x, self._destination_chip_y,
+            (self._destination_chip_x, self._destination_chip_y),
             self._destination_cpu)
 
     def update_for_send(self, source_x: int, source_y: int):