diff --git a/packages/squiggle-lang/src/rescript/ForTS/ForTS_SquiggleValue/ForTS_SquiggleValue_Lambda.res b/packages/squiggle-lang/src/rescript/ForTS/ForTS_SquiggleValue/ForTS_SquiggleValue_Lambda.res
index 5f14f5d3..45b1bd04 100644
--- a/packages/squiggle-lang/src/rescript/ForTS/ForTS_SquiggleValue/ForTS_SquiggleValue_Lambda.res
+++ b/packages/squiggle-lang/src/rescript/ForTS/ForTS_SquiggleValue/ForTS_SquiggleValue_Lambda.res
@@ -3,3 +3,8 @@
 @genType
 let toString = (v: squiggleValue_Lambda): string =>
   ReducerInterface_InternalExpressionValue.toStringLambda(v)
+
+@genType
+let parameters = (v: squiggleValue_Lambda): array<string> => {
+  v.parameters
+}