diff --git a/.gitignore b/.gitignore
index 94473b00..9eb3ea46 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,4 @@ __pycache__
 **/modified_src/
 **/Debug/
 *.dict
+/.mypy_cache/
diff --git a/spinnaker_graph_front_end/utilities/simulator_vertex.py b/spinnaker_graph_front_end/utilities/simulator_vertex.py
index 1cc510e7..77fd14e6 100644
--- a/spinnaker_graph_front_end/utilities/simulator_vertex.py
+++ b/spinnaker_graph_front_end/utilities/simulator_vertex.py
@@ -47,7 +47,7 @@ def __init__(self, label, binary_name: str, vertex_slice=None):
             implements.
         :type vertex_slice: ~pacman.model.graphs.common.Slice or None
         """
-        super().__init__(label)
+        super().__init__(label, vertex_slice=vertex_slice)
         self._binary_name = binary_name
         if not binary_name.lower().endswith(".aplx"):
             log.warning("APLX protocol used but name not matching; "