diff --git a/veilid-flutter/lib/routing_context.dart b/veilid-flutter/lib/routing_context.dart
index 84da321f..cf6e8081 100644
--- a/veilid-flutter/lib/routing_context.dart
+++ b/veilid-flutter/lib/routing_context.dart
@@ -128,8 +128,7 @@ extension DHTRecordDescriptorExt on DHTRecordDescriptor {
 
 @freezed
 class ValueSubkeyRange with _$ValueSubkeyRange {
-  @Assert('low < 0 || low > high', 'low out of range')
-  @Assert('high < 0', 'high out of range')
+  @Assert('low >= 0 && low <= high', 'range is invalid')
   const factory ValueSubkeyRange({
     required int low,
     required int high,
diff --git a/veilid-flutter/lib/routing_context.freezed.dart b/veilid-flutter/lib/routing_context.freezed.dart
index 30d05770..c5114290 100644
--- a/veilid-flutter/lib/routing_context.freezed.dart
+++ b/veilid-flutter/lib/routing_context.freezed.dart
@@ -903,8 +903,7 @@ class __$$ValueSubkeyRangeImplCopyWithImpl<$Res>
 @JsonSerializable()
 class _$ValueSubkeyRangeImpl implements _ValueSubkeyRange {
   const _$ValueSubkeyRangeImpl({required this.low, required this.high})
-      : assert(low < 0 || low > high, 'low out of range'),
-        assert(high < 0, 'high out of range');
+      : assert(low >= 0 && low <= high, 'range is invalid');
 
   factory _$ValueSubkeyRangeImpl.fromJson(Map<String, dynamic> json) =>
       _$$ValueSubkeyRangeImplFromJson(json);