diff --git a/src/slic3r/Utils/OrcaMqttConnection.cpp b/src/slic3r/Utils/OrcaMqttConnection.cpp
index d33e4182c6..983f7b9dd8 100644
--- a/src/slic3r/Utils/OrcaMqttConnection.cpp
+++ b/src/slic3r/Utils/OrcaMqttConnection.cpp
@@ -569,6 +569,9 @@ void OrcaMqttConnection::connect_and_read() {
         ws_read(*connection, buffer, connack_error);
         if (connack_error)
             throw boost::system::system_error(connack_error, "read Orca MQTT CONNACK");
+        // Beast leaves this expiry armed after the synchronous CONNACK read above;
+        // disable it before starting the long-lived async WebSocket session.
+        expires_never(*connection);
         const std::string connack = boost::beast::buffers_to_string(buffer.data());
         // rc: 0 accepted, 1..5 refusal, -1 malformed/not a CONNACK.
         const int rc = (connack.size() == 4 && static_cast<uint8_t>(connack[0]) == 0x20)