diff --git a/src/_shims/index-deno.ts b/src/_shims/index-deno.ts
index 2fd8565..769920a 100644
--- a/src/_shims/index-deno.ts
+++ b/src/_shims/index-deno.ts
@@ -108,3 +108,5 @@ export declare class FsReadStream extends Readable {
 const _ReadableStream = ReadableStream;
 type _ReadableStream = ReadableStream;
 export { _ReadableStream as ReadableStream };
+
+export const init = () => {};
diff --git a/src/_shims/index.d.ts b/src/_shims/index.d.ts
index 32e86b7..0446ffe 100644
--- a/src/_shims/index.d.ts
+++ b/src/_shims/index.d.ts
@@ -79,3 +79,5 @@ export function fileFromPath(path: string, options?: FileFromPathOptions): Promi
 export function fileFromPath(path: string, filename?: string, options?: FileFromPathOptions): Promise<File>;
 
 export function isFsReadStream(value: any): value is FsReadStream;
+
+export const init: () => void;
diff --git a/src/_shims/index.js b/src/_shims/index.js
index 578831c..0289ef5 100644
--- a/src/_shims/index.js
+++ b/src/_shims/index.js
@@ -3,7 +3,9 @@
  */
 const shims = require('./registry');
 const auto = require('zeroentropy/_shims/auto/runtime');
-if (!shims.kind) shims.setShims(auto.getRuntime(), { auto: true });
+exports.init = () => {
+  if (!shims.kind) shims.setShims(auto.getRuntime(), { auto: true });
+};
 for (const property of Object.keys(shims)) {
   Object.defineProperty(exports, property, {
     get() {
@@ -11,3 +13,5 @@ for (const property of Object.keys(shims)) {
     },
   });
 }
+
+exports.init();
diff --git a/src/_shims/index.mjs b/src/_shims/index.mjs
index 6508140..1bcfa59 100644
--- a/src/_shims/index.mjs
+++ b/src/_shims/index.mjs
@@ -3,5 +3,9 @@
  */
 import * as shims from './registry.mjs';
 import * as auto from 'zeroentropy/_shims/auto/runtime';
-if (!shims.kind) shims.setShims(auto.getRuntime(), { auto: true });
+export const init = () => {
+  if (!shims.kind) shims.setShims(auto.getRuntime(), { auto: true });
+};
 export * from './registry.mjs';
+
+init();
diff --git a/src/core.ts b/src/core.ts
index 77c7859..e8a5d73 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -16,7 +16,12 @@ import {
   type RequestInit,
   type Response,
   type HeadersInit,
+  init,
 } from './_shims/index';
+
+// try running side effects outside of _shims/index to workaround https://github.com/vercel/next.js/issues/76881
+init();
+
 export { type Response };
 import { BlobLike, isBlobLike, isMultipartBody } from './uploads';
 export {