diff --git a/src/middleware.ts b/src/middleware.ts
index af00223..57c1d67 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -245,11 +245,11 @@ function get_route_handler(chunks: Record<string, string>, routes: RouteObject[]
 					`baseUrl: "${req.baseUrl}"`,
 					serialized.preloaded && `preloaded: ${serialized.preloaded}`,
 					serialized.store && `store: ${serialized.store}`
-				].filter(Boolean).join(',')}}`
+				].filter(Boolean).join(',')}};`;
 
 				const has_service_worker = fs.existsSync(path.join(locations.dest(), 'service-worker.js'));
 				if (has_service_worker) {
-					`if ('serviceWorker' in navigator) navigator.serviceWorker.register('${req.baseUrl}/service-worker.js')`
+					inline_script += `if ('serviceWorker' in navigator) navigator.serviceWorker.register('${req.baseUrl}/service-worker.js');`;
 				}
 
 				const page = template()
diff --git a/test/common/test.js b/test/common/test.js
index ca4a063..6135160 100644
--- a/test/common/test.js
+++ b/test/common/test.js
@@ -559,6 +559,12 @@ function run({ mode, basepath = '' }) {
 						assert.equal(title, 'woohoo!');
 					});
 			});
+
+			it('includes service worker', () => {
+				return nightmare.goto(base).page.html().then(html => {
+					assert.ok(html.indexOf('service-worker.js') !== -1);
+				});
+			});
 		});
 
 		describe('headers', () => {