diff --git a/packages/adapter-cloudflare-workers/index.js b/packages/adapter-cloudflare-workers/index.js
index a2c106d1a9b3..ee3b45caf4ec 100644
--- a/packages/adapter-cloudflare-workers/index.js
+++ b/packages/adapter-cloudflare-workers/index.js
@@ -63,6 +63,7 @@ export default function ({ config = 'wrangler.toml' } = {}) {
 
 			await esbuild.build({
 				platform: 'browser',
+				conditions: ['worker', 'browser'],
 				sourcemap: 'linked',
 				target: 'es2020',
 				entryPoints: [`${tmp}/entry.js`],
diff --git a/packages/adapter-cloudflare/index.js b/packages/adapter-cloudflare/index.js
index fd5a60c3e230..15197f2cf7b4 100644
--- a/packages/adapter-cloudflare/index.js
+++ b/packages/adapter-cloudflare/index.js
@@ -55,6 +55,7 @@ export default function () {
 
 			await esbuild.build({
 				platform: 'browser',
+				conditions: ['worker', 'browser'],
 				sourcemap: 'linked',
 				target: 'es2020',
 				entryPoints: [`${tmp}/_worker.js`],