diff --git a/packages/js/src/httpClient.ts b/packages/js/src/httpClient.ts
index 60fc8982..9f25b84e 100644
--- a/packages/js/src/httpClient.ts
+++ b/packages/js/src/httpClient.ts
@@ -9,6 +9,10 @@ export interface ClientOptions {
   orgId?: string;
 }
 
+// The browsers don't have process.env, fake it
+const process: { env: Record<string, string | undefined> } =
+  typeof window === 'undefined' ? global.process : { env: {} };
+
 export default abstract class HTTPClient {
   protected readonly client: FetchClient;
 
diff --git a/packages/pino/src/index.ts b/packages/pino/src/index.ts
index 63e2a758..7d306dd9 100644
--- a/packages/pino/src/index.ts
+++ b/packages/pino/src/index.ts
@@ -1,6 +1,10 @@
 import build from 'pino-abstract-transport';
 import { Axiom, ClientOptions } from '@axiomhq/js';
 
+// The browsers don't have process.env, fake it
+const process: { env: Record<string, string | undefined> } =
+  typeof window === 'undefined' ? global.process : { env: {} };
+
 export enum AxiomEventLevel {
   Trace = 'trace',
   Debug = 'debug',
diff --git a/packages/winston/src/index.ts b/packages/winston/src/index.ts
index 51ddcd6d..aa13cac4 100644
--- a/packages/winston/src/index.ts
+++ b/packages/winston/src/index.ts
@@ -2,6 +2,10 @@ import Transport, { TransportStreamOptions } from 'winston-transport';
 
 import { AxiomWithoutBatching } from '@axiomhq/js';
 
+// The browsers don't have process.env, fake it
+const process: { env: Record<string, string | undefined> } =
+  typeof window === 'undefined' ? global.process : { env: {} };
+
 export interface WinstonOptions extends TransportStreamOptions {
   dataset?: string;
   token?: string;