diff --git a/app/errors/api/relay/route.ts b/app/errors/api/relay/route.ts
index c7d562a3..59745e3e 100644
--- a/app/errors/api/relay/route.ts
+++ b/app/errors/api/relay/route.ts
@@ -40,7 +40,8 @@ export async function POST(request: NextRequest) {
 
     const dsnUrl = new URL(realDsn);
     const projectId = dsnUrl.pathname.replace('/', '');
-    const relayUrl = `${dsnUrl.protocol}//${dsnUrl.host}/api/${projectId}/envelope/`;
+    const sentryKey = dsnUrl.username;
+    const relayUrl = `${dsnUrl.protocol}//${dsnUrl.host}/api/${projectId}/envelope/?sentry_key=${sentryKey}`;
 
     logger.debug('Relaying Sentry envelope', {
       projectId,