diff --git a/plugins/inputs/opcua/opcua_client.go b/plugins/inputs/opcua/opcua_client.go
index 8a5d8a58bc97b..53454ba8816a7 100644
--- a/plugins/inputs/opcua/opcua_client.go
+++ b/plugins/inputs/opcua/opcua_client.go
@@ -507,6 +507,7 @@ func disconnect(o *OpcUA) error {
 	case "opc.tcp":
 		o.state = Disconnected
 		o.client.Close()
+		o.client = nil
 		return nil
 	default:
 		return fmt.Errorf("invalid controller")