diff --git a/demo/src/entrypoints/background.ts b/demo/src/entrypoints/background.ts
index 5f18ccb3e..8a2a5b819 100644
--- a/demo/src/entrypoints/background.ts
+++ b/demo/src/entrypoints/background.ts
@@ -7,6 +7,7 @@ export default defineBackground({
     console.log(browser.runtime.id);
     logId();
     console.log({
+      url: import.meta.url,
       browser: import.meta.env.BROWSER,
       chrome: import.meta.env.CHROME,
       firefox: import.meta.env.FIREFOX,
diff --git a/src/core/builders/vite/index.ts b/src/core/builders/vite/index.ts
index 79c197df2..940c9da2b 100644
--- a/src/core/builders/vite/index.ts
+++ b/src/core/builders/vite/index.ts
@@ -63,6 +63,7 @@ export async function createViteBuilder(
       wxtPlugins.noopBackground(),
       wxtPlugins.globals(wxtConfig),
       wxtPlugins.excludeBrowserPolyfill(wxtConfig),
+      wxtPlugins.defineImportMeta(),
     );
     if (wxtConfig.analysis.enabled) {
       config.plugins.push(wxtPlugins.bundleAnalysis());
diff --git a/src/core/builders/vite/plugins/defineImportMeta.ts b/src/core/builders/vite/plugins/defineImportMeta.ts
new file mode 100644
index 000000000..9d4b9781d
--- /dev/null
+++ b/src/core/builders/vite/plugins/defineImportMeta.ts
@@ -0,0 +1,19 @@
+/**
+ * Overrides definitions for `import.meta.*`
+ *
+ * - `import.meta.url`: Without this, background service workers crash trying to access
+ *   `document.location`, see https://github.com/wxt-dev/wxt/issues/392
+ */
+export function defineImportMeta() {
+  return {
+    name: 'wxt:define',
+    config() {
+      return {
+        define: {
+          // This works for all extension contexts, including background service worker
+          'import.meta.url': 'self.location.href',
+        },
+      };
+    },
+  };
+}
diff --git a/src/core/builders/vite/plugins/index.ts b/src/core/builders/vite/plugins/index.ts
index b5a5da1ee..5f7973be1 100644
--- a/src/core/builders/vite/plugins/index.ts
+++ b/src/core/builders/vite/plugins/index.ts
@@ -12,3 +12,4 @@ export * from './globals';
 export * from './webextensionPolyfillMock';
 export * from './excludeBrowserPolyfill';
 export * from './entrypointGroupGlobals';
+export * from './defineImportMeta';