diff --git a/spynnaker/pyNN/models/neuron/abstract_population_vertex.py b/spynnaker/pyNN/models/neuron/abstract_population_vertex.py
index d1607220b3..7988acb9c4 100644
--- a/spynnaker/pyNN/models/neuron/abstract_population_vertex.py
+++ b/spynnaker/pyNN/models/neuron/abstract_population_vertex.py
@@ -1252,6 +1252,7 @@ def get_connections_from_machine(
             return self.__connection_cache[app_edge, synapse_info]
 
         # Start with something in the list so that concatenate works
+        connections: ConnectionsArray
         connections = [numpy.zeros(0, dtype=NUMPY_CONNECTORS_DTYPE)]
         progress = ProgressBar(
             len(self.machine_vertices),