diff --git a/metricflow-semantics/metricflow_semantics/time/time_spine_source.py b/metricflow-semantics/metricflow_semantics/time/time_spine_source.py
index 27655a5c00..44cc937f53 100644
--- a/metricflow-semantics/metricflow_semantics/time/time_spine_source.py
+++ b/metricflow-semantics/metricflow_semantics/time/time_spine_source.py
@@ -46,7 +46,7 @@ def create_from_manifest(semantic_manifest: SemanticManifest) -> Dict[TimeGranul
                 db_name=time_spine.node_relation.database,
                 base_column=time_spine.primary_column.name,
                 base_granularity=time_spine.primary_column.time_granularity,
-                custom_granularity_columns=[column.name for column in time_spine.custom_granularity_columns],
+                custom_granularity_columns=[column.name for column in time_spine.custom_granularities],
             )
             for time_spine in semantic_manifest.project_configuration.time_spines
         }