diff --git a/hosts/ficolobuild/configuration.nix b/hosts/ficolobuild/configuration.nix
index e6dcece7..c10b9de5 100644
--- a/hosts/ficolobuild/configuration.nix
+++ b/hosts/ficolobuild/configuration.nix
@@ -43,4 +43,9 @@
     172.18.20.102 vedenemo.dev # for fetching Gala app sources
     172.18.20.109 cache.vedenemo.dev # Binary cache
   ";
+
+  # Trust Themisto Hydra user
+  nix.settings = {
+    trusted-users = ["root" "themisto"];
+  };
 }