diff --git a/nixos/modules/services/misc/dendrite.nix b/nixos/modules/services/misc/dendrite.nix
index 89bb989a09ec..35bec40926ec 100644
--- a/nixos/modules/services/misc/dendrite.nix
+++ b/nixos/modules/services/misc/dendrite.nix
@@ -247,6 +247,7 @@ in
         WorkingDirectory = workingDir;
         RuntimeDirectory = "dendrite";
         RuntimeDirectoryMode = "0700";
+        LimitNOFILE = 65535;
         EnvironmentFile = lib.mkIf (cfg.environmentFile != null) cfg.environmentFile;
         ExecStartPre = ''
           ${pkgs.envsubst}/bin/envsubst \