diff --git a/metricflow-semantics/metricflow_semantics/sql/sql_exprs.py b/metricflow-semantics/metricflow_semantics/sql/sql_exprs.py
index 2b8d8e667..b0cb079eb 100644
--- a/metricflow-semantics/metricflow_semantics/sql/sql_exprs.py
+++ b/metricflow-semantics/metricflow_semantics/sql/sql_exprs.py
@@ -1822,8 +1822,7 @@ def create(  # noqa: D102
     ) -> SqlCaseExpression:
         parent_nodes: Tuple[SqlExpressionNode, ...] = ()
         for when, then in when_to_then_exprs.items():
-            parent_nodes += (when,)
-            parent_nodes += (then,)
+            parent_nodes += (when, then)
 
         if else_expr:
             parent_nodes += (else_expr,)