diff --git a/package.json b/package.json
index 91af33b3a..d9a3c8ba0 100644
--- a/package.json
+++ b/package.json
@@ -77,12 +77,12 @@
     },
     {
       "path": "./build/releases/OneSignalSDK.page.es6.js",
-      "limit": "42.7 kB",
+      "limit": "42.57 kB",
       "gzip": true
     },
     {
       "path": "./build/releases/OneSignalSDK.sw.js",
-      "limit": "12.65 kB",
+      "limit": "12.51 kB",
       "gzip": true
     },
     {
diff --git a/src/shared/helpers/context.test.ts b/src/shared/helpers/context.test.ts
new file mode 100644
index 000000000..3aea63f2d
--- /dev/null
+++ b/src/shared/helpers/context.test.ts
@@ -0,0 +1,37 @@
+import { describe, expect, test } from 'vite-plus/test';
+
+import type { AppConfig } from '../config/types';
+import type { ContextInterface } from '../context/types';
+import { getServiceWorkerManager } from './context';
+
+const buildContext = (path: string, serviceWorkerPath: string): ContextInterface =>
+  ({
+    _appConfig: {
+      userConfig: { path, serviceWorkerPath },
+    } as AppConfig,
+  }) as ContextInterface;
+
+const workerPathFor = (path: string, serviceWorkerPath: string): string => {
+  const manager = getServiceWorkerManager(buildContext(path, serviceWorkerPath));
+  return manager['_config'].workerPath._getFullPath();
+};
+
+describe('getServiceWorkerManager worker path', () => {
+  test('joins default root path with worker file name', () => {
+    expect(workerPathFor('/', 'OneSignalSDKWorker.js')).toBe('/OneSignalSDKWorker.js');
+  });
+
+  test('collapses a leading slash in serviceWorkerPath to avoid a protocol-relative URL', () => {
+    expect(workerPathFor('/', '/OneSignalSDKWorker.js')).toBe('/OneSignalSDKWorker.js');
+  });
+
+  test('joins a nested path with a trailing slash', () => {
+    expect(workerPathFor('/push/onesignal/', 'OneSignalSDKWorker.js')).toBe(
+      '/push/onesignal/OneSignalSDKWorker.js',
+    );
+  });
+
+  test('normalizes slashes on both sides of the join', () => {
+    expect(workerPathFor('/push/', '/OneSignalSDKWorker.js')).toBe('/push/OneSignalSDKWorker.js');
+  });
+});
diff --git a/src/shared/helpers/context.ts b/src/shared/helpers/context.ts
index 3b33513c2..0011a66a9 100644
--- a/src/shared/helpers/context.ts
+++ b/src/shared/helpers/context.ts
@@ -17,9 +17,12 @@ export function getServiceWorkerManager(context: ContextInterface): ServiceWorke
 
   if (config.userConfig) {
     if (config.userConfig.path) {
-      serviceWorkerManagerConfig.workerPath = new Path(
-        `${config.userConfig.path}${config.userConfig.serviceWorkerPath}`,
-      );
+      // Join with exactly one slash. A leading "//" forms a protocol-relative
+      // URL, which the browser resolves to a different origin and rejects with a
+      // SecurityError when registering the worker.
+      const basePath = config.userConfig.path.replace(/\/+$/, '');
+      const workerPath = (config.userConfig.serviceWorkerPath ?? '').replace(/^\/+/, '');
+      serviceWorkerManagerConfig.workerPath = new Path(`${basePath}/${workerPath}`);
     }
     if (config.userConfig.serviceWorkerParam) {
       serviceWorkerManagerConfig.registrationOptions = config.userConfig.serviceWorkerParam;