diff --git a/crates/cli/tests/reference/wasm-export-types.d.ts b/crates/cli/tests/reference/wasm-export-types.d.ts
index eb562cd6fb0..a5f399db59d 100644
--- a/crates/cli/tests/reference/wasm-export-types.d.ts
+++ b/crates/cli/tests/reference/wasm-export-types.d.ts
@@ -1,12 +1,14 @@
 /* tslint:disable */
 /* eslint-disable */
 export function example(a: number, b: bigint, c: any, d: string): string;
+export function example_128(a: bigint): bigint | undefined;
 
 export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module;
 
 export interface InitOutput {
   readonly memory: WebAssembly.Memory;
   readonly example: (a: number, b: bigint, c: any, d: number, e: number) => [number, number];
+  readonly example_128: (a: bigint, b: bigint) => [number, bigint, bigint];
   readonly __wbindgen_export_0: WebAssembly.Table;
   readonly __wbindgen_malloc: (a: number, b: number) => number;
   readonly __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
diff --git a/crates/cli/tests/reference/wasm-export-types.js b/crates/cli/tests/reference/wasm-export-types.js
index fc6b51ee861..de290e90502 100644
--- a/crates/cli/tests/reference/wasm-export-types.js
+++ b/crates/cli/tests/reference/wasm-export-types.js
@@ -95,6 +95,15 @@ export function example(a, b, c, d) {
     }
 }
 
+/**
+ * @param {bigint} a
+ * @returns {bigint | undefined}
+ */
+export function example_128(a) {
+    const ret = wasm.example_128(a, a >> BigInt(64));
+    return ret[0] === 0 ? undefined : (BigInt.asUintN(64, ret[1]) | (BigInt.asUintN(64, ret[2]) << BigInt(64)));
+}
+
 async function __wbg_load(module, imports) {
     if (typeof Response === 'function' && module instanceof Response) {
         if (typeof WebAssembly.instantiateStreaming === 'function') {
diff --git a/crates/cli/tests/reference/wasm-export-types.rs b/crates/cli/tests/reference/wasm-export-types.rs
index 2911442e640..06f89d912e0 100644
--- a/crates/cli/tests/reference/wasm-export-types.rs
+++ b/crates/cli/tests/reference/wasm-export-types.rs
@@ -10,3 +10,8 @@ use wasm_bindgen::prelude::*;
 pub fn example(a: u32, b: u64, c: JsValue, d: &str) -> String {
     todo!()
 }
+
+#[wasm_bindgen]
+pub fn example_128(a: u128) -> Option<u128> {
+    None
+}
diff --git a/crates/cli/tests/reference/wasm-export-types.wat b/crates/cli/tests/reference/wasm-export-types.wat
index dcb407e93b8..195c25a5723 100644
--- a/crates/cli/tests/reference/wasm-export-types.wat
+++ b/crates/cli/tests/reference/wasm-export-types.wat
@@ -4,15 +4,18 @@
   (type (;2;) (func (param i32 i32 i32)))
   (type (;3;) (func (param i32 i32 i32 i32) (result i32)))
   (type (;4;) (func (param i32 i64 externref i32 i32) (result i32 i32)))
+  (type (;5;) (func (param i64 i64) (result i32 i64 i64)))
   (import "wbg" "__wbindgen_init_externref_table" (func (;0;) (type 0)))
   (func $__wbindgen_realloc (;1;) (type 3) (param i32 i32 i32 i32) (result i32))
   (func $__wbindgen_malloc (;2;) (type 1) (param i32 i32) (result i32))
   (func $__wbindgen_free (;3;) (type 2) (param i32 i32 i32))
   (func $"example externref shim multivalue shim" (;4;) (type 4) (param i32 i64 externref i32 i32) (result i32 i32))
+  (func $"example_128 multivalue shim" (;5;) (type 5) (param i64 i64) (result i32 i64 i64))
   (table (;0;) 128 externref)
   (memory (;0;) 17)
   (export "memory" (memory 0))
   (export "example" (func $"example externref shim multivalue shim"))
+  (export "example_128" (func $"example_128 multivalue shim"))
   (export "__wbindgen_export_0" (table 0))
   (export "__wbindgen_malloc" (func $__wbindgen_malloc))
   (export "__wbindgen_realloc" (func $__wbindgen_realloc))