diff --git a/nixos/modules/services/web-apps/bentopdf.nix b/nixos/modules/services/web-apps/bentopdf.nix
index 651896c41ea4..bf03beccc938 100644
--- a/nixos/modules/services/web-apps/bentopdf.nix
+++ b/nixos/modules/services/web-apps/bentopdf.nix
@@ -71,7 +71,7 @@ in
             '';
           };
 
-          locations."~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$".extraConfig = ''
+          locations."~* \\.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$".extraConfig = ''
             expires 1y;
             add_header Cache-Control "public, immutable";
           '';