diff --git a/src/cli/export.ts b/src/cli/export.ts
index 9618c70..99eee4c 100644
--- a/src/cli/export.ts
+++ b/src/cli/export.ts
@@ -35,12 +35,12 @@ export async function exporter(export_dir: string, { basepath = '' }) {
 
 	const proc = child_process.fork(path.resolve(`${build_dir}/server.js`), [], {
 		cwd: process.cwd(),
-		env: {
+		env: Object.assign({}, process.env, {
 			PORT: port,
 			NODE_ENV: 'production',
 			SAPPER_DEST: build_dir,
 			SAPPER_EXPORT: 'true'
-		}
+		})
 	});
 
 	const seen = new Set();
@@ -103,4 +103,4 @@ export async function exporter(export_dir: string, { basepath = '' }) {
 	return ports.wait(port)
 		.then(() => handle(new URL(`/${basepath}`, origin))) // TODO all static routes
 		.then(() => proc.kill());
-}
\ No newline at end of file
+}