diff --git a/metricflow/dataflow/nodes/join_to_custom_granularity.py b/metricflow/dataflow/nodes/join_to_custom_granularity.py
index eeab313a9c..6f13f6ece4 100644
--- a/metricflow/dataflow/nodes/join_to_custom_granularity.py
+++ b/metricflow/dataflow/nodes/join_to_custom_granularity.py
@@ -23,6 +23,7 @@ class JoinToCustomGranularityNode(DataflowPlanNode, ABC):
     time_dimension_spec: TimeDimensionSpec
 
     def __post_init__(self) -> None:  # noqa: D105
+        super().__post_init__()
         assert (
             self.time_dimension_spec.time_granularity.is_custom_granularity
         ), "Time granularity for time dimension spec in JoinToCustomGranularityNode must be qualified as custom granularity."