diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_Type/Reducer_Type_switch_replacement_test.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_Type/Reducer_Type_switch_replacement_test.res
index a439bb3c..16f0f118 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_Type/Reducer_Type_switch_replacement_test.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_Type/Reducer_Type_switch_replacement_test.res
@@ -103,7 +103,7 @@ let _dispatch = (
   chain,
 ): result<internalExpressionValue, 'e> => {
   let dispatchChainPiece = makeMyDispatchChainPiece(reducer)
-  dispatchChainPiece(call, environment)->E.O2.default(chain(call, environment, reducer))
+  dispatchChainPiece(call, environment)->E.O2.defaultFn(() => chain(call, environment, reducer))
 }
 
 // What is important about this implementation?