diff --git a/packages/backend/src/server/api/endpoints/admin/update-meta.ts b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
index 15f59907af..2cdb8feb1b 100644
--- a/packages/backend/src/server/api/endpoints/admin/update-meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
@@ -129,7 +129,7 @@ export const paramDef = {
 		useObjectStorage: { type: 'boolean' },
 		objectStorageBaseUrl: { type: 'string', nullable: true },
 		objectStorageBucket: { type: 'string', nullable: true },
-		objectStoragePrefix: { type: 'string', pattern: /^[a-zA-Z0-9-._]*$/.source, nullable: true },
+		objectStoragePrefix: { type: 'string', pattern: /^[a-zA-Z0-9-._\/]*$/.source, nullable: true },
 		objectStorageEndpoint: { type: 'string', nullable: true },
 		objectStorageRegion: { type: 'string', nullable: true },
 		objectStoragePort: { type: 'integer', nullable: true },