diff --git a/lib/models/dns_info.dart b/lib/models/dns_info.dart
index 10d5030..528ca5b 100644
--- a/lib/models/dns_info.dart
+++ b/lib/models/dns_info.dart
@@ -9,7 +9,7 @@ class DnsInfo {
   bool dnssecEnabled;
   bool disableIpv6;
   String? upstreamMode;
-  int cacheSize;
+  int? cacheSize;
   int cacheTtlMin;
   int cacheTtlMax;
   bool cacheOptimistic;