diff --git a/ogdo.nix b/ogdo.nix
index 8aed981..6c8898f 100644
--- a/ogdo.nix
+++ b/ogdo.nix
@@ -29,6 +29,9 @@
       locations."~ ^/.+" = {
         root = "/srv/ogdo/served-files";
         tryFiles = "$uri =404";
+        extraConfig = ''
+          default_type application/pdf;
+        '';
       };
     };
   };