diff --git a/lib/microwaveprop/pskr/client.ex b/lib/microwaveprop/pskr/client.ex
index 61511c79..9c8b0356 100644
--- a/lib/microwaveprop/pskr/client.ex
+++ b/lib/microwaveprop/pskr/client.ex
@@ -178,7 +178,11 @@ defmodule Microwaveprop.Pskr.Client do
   # ---------- Connection setup ----------
 
   defp do_connect(state) do
-    tcp_opts = [:binary, active: :once, packet: :raw, keepalive: true]
+    # `:inet` forces IPv4 resolution + an IPv4 socket. Without
+    # this, BEAM can pick the broker's AAAA record while our K8s
+    # pod has IPv4-only egress, and `:gen_tcp.connect/4` fails
+    # with `:einval` from the kernel `connect()` syscall.
+    tcp_opts = [:binary, :inet, active: :once, packet: :raw, keepalive: true]
 
     with {:ok, socket} <- :gen_tcp.connect(@broker_host, @broker_port, tcp_opts, 10_000),
          :ok <- :gen_tcp.send(socket, Mqtt.connect(state.client_id, @keepalive_seconds)),