diff --git a/ApiCore-Backend/src/public/public.controller.ts b/ApiCore-Backend/src/public/public.controller.ts
index 148cb0b..4b7bc20 100644
--- a/ApiCore-Backend/src/public/public.controller.ts
+++ b/ApiCore-Backend/src/public/public.controller.ts
@@ -5,7 +5,7 @@ import { Public } from '../auth/decorators/public.decorator';
 import { PublicBatch, PublicService } from './public.service';
 
 // What a printed lot number can look like - anything else is not a lot.
-const LOT_NUMBER_PATTERN = /^[A-Za-z0-9._\/-]{1,64}$/;
+const LOT_NUMBER_PATTERN = /^[A-Za-z0-9._/-]{1,64}$/;
 
 @ApiTags('public')
 @Public()