diff --git a/packages/api/src/agents/__tests__/run-summarization.test.ts b/packages/api/src/agents/__tests__/run-summarization.test.ts
index 6b0b6bdc8e..fcb780b91d 100644
--- a/packages/api/src/agents/__tests__/run-summarization.test.ts
+++ b/packages/api/src/agents/__tests__/run-summarization.test.ts
@@ -1194,7 +1194,7 @@ describe('Langfuse run config', () => {
             collectorUrl: 'http://langfuse-fanout-collector:4318',
           },
         },
-      } as AppConfig,
+      } as unknown as AppConfig,
     });
 
     expect(callArgs.langfuse).toEqual({
diff --git a/packages/api/src/langfuse/config.ts b/packages/api/src/langfuse/config.ts
index ea8e6e45cd..5f4fdb700d 100644
--- a/packages/api/src/langfuse/config.ts
+++ b/packages/api/src/langfuse/config.ts
@@ -5,6 +5,10 @@ import { normalizeString } from '~/utils/text';
 import { isTrueEnv } from './utils';
 
 type LangfuseRunConfig = NonNullable<RunConfig['langfuse']>;
+type LangfuseAppConfig = NonNullable<AppConfig['langfuse']>;
+export type LangfuseFanoutConfig = LangfuseAppConfig['fanout'] & {
+  collectorUrl?: string;
+};
 type LangfuseRunConfigWithTraceAttributes = LangfuseRunConfig & {
   librechatTraceAttributes?: Record<string, string | number | boolean | null | undefined>;
 };
@@ -16,7 +20,7 @@ export function isLangfuseTenantExportEnabled(): boolean {
   return !isTrueEnv(process.env.LANGFUSE_FANOUT_TENANT_EXPORT_DISABLED);
 }
 
-export function isLangfuseFanoutEnabled(fanout?: AppConfig['langfuse']['fanout']): boolean {
+export function isLangfuseFanoutEnabled(fanout?: LangfuseFanoutConfig): boolean {
   return (
     fanout?.enabled !== false &&
     (fanout?.enabled === true || isTrueEnv(process.env.LANGFUSE_FANOUT_ENABLED))
@@ -89,7 +93,7 @@ export function buildLangfuseConfig({
   const publicKey = normalizeString(config?.publicKey);
   const secretKey = normalizeString(config?.secretKey);
   const hasTenantCredentials = Boolean(publicKey && secretKey);
-  const fanout = config?.fanout;
+  const fanout = config?.fanout as LangfuseFanoutConfig | undefined;
   const fanoutEnabled = isLangfuseFanoutEnabled(fanout);
   const fanoutCollectorUrl =
     normalizeString(fanout?.collectorUrl) ??
diff --git a/packages/api/src/langfuse/destinations.ts b/packages/api/src/langfuse/destinations.ts
index dcaa78654e..c4ea0155c8 100644
--- a/packages/api/src/langfuse/destinations.ts
+++ b/packages/api/src/langfuse/destinations.ts
@@ -1,4 +1,5 @@
 import type { AppConfig } from '@librechat/data-schemas';
+import type { LangfuseFanoutConfig } from './config';
 import { isLangfuseFanoutEnabled, isLangfuseTenantExportEnabled } from './config';
 import { resolveLangfuseTenantDestination } from './tenantDestinations';
 import { isFalseEnv, toBasicAuthorization } from './utils';
@@ -69,11 +70,12 @@ function getTenantScoreDestination(appConfig?: AppConfig): LangfuseScoreDestinat
   if (config?.enabled === false) {
     return undefined;
   }
-  if (!isLangfuseFanoutEnabled(config?.fanout)) {
+  const fanout = config?.fanout as LangfuseFanoutConfig | undefined;
+  if (!isLangfuseFanoutEnabled(fanout)) {
     return undefined;
   }
   const fanoutCollectorUrl =
-    normalizeString(config?.fanout?.collectorUrl) ??
+    normalizeString(fanout?.collectorUrl) ??
     normalizeString(process.env.LANGFUSE_FANOUT_COLLECTOR_URL);
   if (!fanoutCollectorUrl) {
     return undefined;