diff --git a/unittests/model_tests/neuron/test_synaptic_manager.py b/unittests/model_tests/neuron/test_synaptic_manager.py
index c4d619c4ec..e3b5b1b287 100644
--- a/unittests/model_tests/neuron/test_synaptic_manager.py
+++ b/unittests/model_tests/neuron/test_synaptic_manager.py
@@ -83,7 +83,7 @@ def write_memory(
         return (-1, -1)
 
     @overrides(Transceiver.get_region_base_address)
-    def get_region_base_address(self, x: int, y: int, p: int):
+    def get_region_base_address(self, x: int, y: int, p: int) -> int:
         return 0
 
     @overrides(MockableTransceiver.read_memory)