diff --git a/api/agent_config.go b/api/agent_config.go
index 12be9d2..ccff0c5 100644
--- a/api/agent_config.go
+++ b/api/agent_config.go
@@ -14,6 +14,7 @@ type K3sAgentConfig struct {
 	WithNodeId               string   `json:"with-node-id,omitempty" yaml:"with-node-id,omitempty"`
 	NodeIP                   string   `json:"node-ip,omitempty" yaml:"node-ip,omitempty"`
 	NodeExternalIP           string   `json:"node-external-ip,omitempty" yaml:"node-external-ip,omitempty"`
+	FlannelBackend           string   `json:"flannel-backend,omitempty" yaml:"flannel-backend,omitempty"`
 	FlannelIface             string   `json:"flannel-iface,omitempty" yaml:"flannel-iface,omitempty"`
 	FlannelConf              string   `json:"flannel-conf,omitempty" yaml:"flannel-conf,omitempty"`
 	FlannelCniConfFile       string   `json:"flannel-cni-conf-file,omitempty" yaml:"flannel-cni-conf-file,omitempty"`