diff --git a/packages/db/adapters/DittoPglite.test.ts b/packages/db/adapters/DittoPglite.test.ts
index b0d9f4d1..4cea878f 100644
--- a/packages/db/adapters/DittoPglite.test.ts
+++ b/packages/db/adapters/DittoPglite.test.ts
@@ -1,14 +1,22 @@
-import { assertEquals } from '@std/assert';
+import { assertEquals, assertRejects } from '@std/assert';
 
 import { DittoPglite } from './DittoPglite.ts';
 
 Deno.test('DittoPglite', async () => {
-  const db = new DittoPglite('memory://');
+  await using db = new DittoPglite('memory://');
   await db.migrate();
 
   assertEquals(db.poolSize, 1);
   assertEquals(db.availableConnections, 1);
-
-  await db.kysely.destroy();
-  await new Promise((resolve) => setTimeout(resolve, 100));
+});
+
+Deno.test('DittoPglite query after closing', async () => {
+  const db = new DittoPglite('memory://');
+  await db[Symbol.asyncDispose]();
+
+  await assertRejects(
+    () => db.kysely.selectFrom('nostr_events').selectAll().execute(),
+    Error,
+    'PGlite is closed',
+  );
 });
diff --git a/packages/db/adapters/DittoPglite.ts b/packages/db/adapters/DittoPglite.ts
index 7fcd5bab..bac1ebaa 100644
--- a/packages/db/adapters/DittoPglite.ts
+++ b/packages/db/adapters/DittoPglite.ts
@@ -47,6 +47,16 @@ export class DittoPglite implements DittoDB {
   }
 
   async [Symbol.asyncDispose](): Promise<void> {
-    await this.kysely.destroy();
+    try {
+      // FIXME: `kysely.destroy()` calls `pglite.close()` internally, but it doesn't work.
+      await this.pglite.close();
+      await this.kysely.destroy();
+    } catch (e) {
+      if (e instanceof Error && e.message === 'PGlite is closed') {
+        // Make dispose idempotent.
+      } else {
+        throw e;
+      }
+    }
   }
 }