diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index a14dd5e6..cf4597a5 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -1132,6 +1132,7 @@ in
     maxUploadSize = "2G";
     config.adminpassFile = "/etc/nixos/secret/nextcloud_pass.txt";
     config.defaultPhoneRegion = "HK";
+    phpOptions."opcache.interned_strings_buffer" = "12";
   };
 
   services.hedgedoc = {