diff --git a/server/lib/server/application.ex b/server/lib/server/application.ex
index 6e1b1f5..86c0c05 100644
--- a/server/lib/server/application.ex
+++ b/server/lib/server/application.ex
@@ -25,7 +25,11 @@ defmodule Server.Application do
     # for other strategies and supported options
     opts = [strategy: :one_for_one, name: Server.Supervisor]
     result = Supervisor.start_link(children, opts)
-    with {:ok, _} <- result, do: Server.Hosts.mark_all_offline()
+
+    if Phoenix.Endpoint.server?(:server, ServerWeb.Endpoint) do
+      with {:ok, _} <- result, do: Server.Hosts.mark_all_offline()
+    end
+
     result
   end