diff --git a/packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Helpers.res b/packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Helpers.res
index 1b94c6bf..3edbe5da 100644
--- a/packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Helpers.res
+++ b/packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Helpers.res
@@ -1,7 +1,8 @@
 open FunctionRegistry_Core
+open Reducer_T
 
 let impossibleErrorString = "Wrong inputs / Logically impossible"
-let impossibleError: errorValue = impossibleErrorString->REOther
+let impossibleError: errorValue = impossibleErrorString->Reducer_ErrorValue.REOther
 let wrapError = e => Reducer_ErrorValue.REOther(e)
 
 module Wrappers = {