diff --git a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
index d0d88b2a..aa27d7ec 100644
--- a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
+++ b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
@@ -255,11 +255,10 @@ let dispatch = (call: functionCall, environment, reducer: ExpressionT.reducerFn)
   errorValue,
 > =>
   try {
-    let callInternalWithReducer = (call, environment) => callInternal(call, environment, reducer)
     let (fn, args) = call
     // There is a bug that prevents string match in patterns
     // So we have to recreate a copy of the string
-    ExternalLibrary.dispatch((Js.String.make(fn), args), environment, callInternalWithReducer)
+    ExternalLibrary.dispatch((Js.String.make(fn), args), environment, reducer, callInternal)
   } catch {
   | Js.Exn.Error(obj) => REJavaScriptExn(Js.Exn.message(obj), Js.Exn.name(obj))->Error
   | _ => RETodo("unhandled rescript exception")->Error
diff --git a/packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_ExternalLibrary.res b/packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_ExternalLibrary.res
index 3e6172c9..2a479bb5 100644
--- a/packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_ExternalLibrary.res
+++ b/packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_ExternalLibrary.res
@@ -23,7 +23,7 @@ let tryRegistry = ((fnName, args): InternalExpressionValue.functionCall, env) =>
   )
 }
 
-let dispatch = (call: InternalExpressionValue.functionCall, environment, chain): result<
+let dispatch = (call: InternalExpressionValue.functionCall, environment, reducer, chain): result<
   internalExpressionValue,
   'e,
 > => {
@@ -33,7 +33,7 @@ let dispatch = (call: InternalExpressionValue.functionCall, environment, chain):
     () => ReducerInterface_Duration.dispatch(call, environment),
     () => ReducerInterface_Number.dispatch(call, environment),
     () => tryRegistry(call, environment),
-  ])->E.O2.default(chain(call, environment))
+  ])->E.O2.default(chain(call, environment, reducer))
 }
 /*
 If your dispatch is too big you can divide it into smaller dispatches and pass the call so that it gets called finally.