diff --git a/src/emails/emails.spec.ts b/src/emails/emails.spec.ts
index a30fa38b..075d5fbf 100644
--- a/src/emails/emails.spec.ts
+++ b/src/emails/emails.spec.ts
@@ -955,11 +955,11 @@ describe('Emails', () => {
         },
       });
       expect(fetchMock.mock.calls[0][0]).toBe(
-        'https://api.resend.com/emails/metrics?start_date=2026-07-01&end_date=2026-07-08&timezone=America%2FNew_York&granularity=daily&metrics=sent%2Cdelivered%2Copen_rate&dimensions=period%2Cdomain&filter%5Bdomain_id%5D=d91cd9bd-1176-4f47-2a4b-fce2d5399cbf',
+        'https://api.resend.com/emails/metrics?start_date=2026-07-01&end_date=2026-07-08&timezone=America%2FNew_York&granularity=daily&metrics=sent%2Cdelivered%2Copen_rate&dimensions=period%2Cdomain&domain_id=d91cd9bd-1176-4f47-2a4b-fce2d5399cbf',
       );
     });
 
-    it('calls endpoint passing the email dimension and filter[email_id]', async () => {
+    it('calls endpoint passing the email dimension and email_id', async () => {
       const response: GetEmailsMetricsResponseSuccess = {
         object: 'metrics',
         start_date: '2026-07-01T00:00:00.000Z',
@@ -1005,7 +1005,7 @@ describe('Emails', () => {
         },
       });
       expect(fetchMock.mock.calls[0][0]).toBe(
-        'https://api.resend.com/emails/metrics?start_date=2026-07-01&end_date=2026-07-08&timezone=America%2FNew_York&granularity=daily&metrics=sent%2Cdelivered%2Copen_rate&dimensions=period%2Cemail&filter%5Bemail_id%5D=4dd369bc-aa82-4ff3-97de-514ae3000ee0',
+        'https://api.resend.com/emails/metrics?start_date=2026-07-01&end_date=2026-07-08&timezone=America%2FNew_York&granularity=daily&metrics=sent%2Cdelivered%2Copen_rate&dimensions=period%2Cemail&email_id=4dd369bc-aa82-4ff3-97de-514ae3000ee0',
       );
     });
 
diff --git a/src/emails/emails.ts b/src/emails/emails.ts
index 40c780f7..19d5e16b 100644
--- a/src/emails/emails.ts
+++ b/src/emails/emails.ts
@@ -124,8 +124,8 @@ function buildMetricsQuery(options: GetEmailsMetricsOptions) {
     granularity: options.granularity,
     metrics: options.metrics?.join(','),
     dimensions: options.dimensions?.join(','),
-    'filter[domain_id]': options.filter?.domainId?.join(','),
-    'filter[email_id]': options.filter?.emailId?.join(','),
+    domain_id: options.filter?.domainId?.join(','),
+    email_id: options.filter?.emailId?.join(','),
     sort_by: options.sortBy,
     sort_order: options.sortOrder,
   };