diff --git a/nixos/tests/paperless.nix b/nixos/tests/paperless.nix
index 3d834b29958d..3ef291ba7e06 100644
--- a/nixos/tests/paperless.nix
+++ b/nixos/tests/paperless.nix
@@ -23,6 +23,7 @@ import ./make-test-python.nix ({ lib, ... }: {
       };
       services.paperless.settings = {
         PAPERLESS_DBHOST = "/run/postgresql";
+        PAPERLESS_OCR_LANGUAGE = "deu";
       };
     };
   }; in self;