diff --git a/nixos/hosts/osaka-linode-01/podman/derp.nix b/nixos/hosts/osaka-linode-01/podman/derp.nix
index a1248f0e..3170a206 100644
--- a/nixos/hosts/osaka-linode-01/podman/derp.nix
+++ b/nixos/hosts/osaka-linode-01/podman/derp.nix
@@ -16,6 +16,7 @@
       DERP_CERT_MODE = "manual";
       DERP_DOMAIN = "sysctl.io";
       DERP_STUN = "true";
+      DERP_VERIFY_CLIENTS = "true";
     };
     volumes = [
       "/Storage/Data/Docker/sysctl.io/letsencrypt/external/certificates/certs/*.sysctl.io.crt:/app/certs/sysctl.io.crt:ro"