diff --git a/src/GameCult.Caching/CultInspectorModel.cs b/src/GameCult.Caching/CultInspectorModel.cs
index 7c3cb45e..efb602d3 100644
--- a/src/GameCult.Caching/CultInspectorModel.cs
+++ b/src/GameCult.Caching/CultInspectorModel.cs
@@ -561,7 +561,7 @@ namespace GameCult.Caching
             CultInspectorGrouping Refused(string reason) =>
                 new CultInspectorGrouping(listed, Array.Empty<CultInspectorMember>(), $"[CultInspectorGroupBy] on {listed.Name}: {reason} The list is not grouped.");
 
-            if (listed.GetCustomAttribute<CultGlobalAttribute>(true) != null)
+            if (listed.GetCustomAttribute<CultGlobalAttribute>() != null)
                 return Refused("a global document is never grouped.");
             var members = new List<CultInspectorMember>();
             foreach (var name in declared.Members)
diff --git a/tests/GameCult.Caching.Tests/CultInspectorModelTests.cs b/tests/GameCult.Caching.Tests/CultInspectorModelTests.cs
index 3432c858..bf0c815a 100644
--- a/tests/GameCult.Caching.Tests/CultInspectorModelTests.cs
+++ b/tests/GameCult.Caching.Tests/CultInspectorModelTests.cs
@@ -630,7 +630,6 @@ namespace GameCult.Caching.Tests
         [TestCase(typeof(GroupDuplicate), "Kind")]
         [TestCase(typeof(GroupValidThenInvalid), "Mass")]
         [TestCase(typeof(GroupGlobal), "global")]
-        [TestCase(typeof(GroupGlobalChild), "global")]
         public void GroupInvalidDeclarationsGiveANoticeAndAFlatList(Type listed, string mentions)
         {
             var model = GroupModel();
@@ -888,17 +887,12 @@ namespace GameCult.Caching.Tests
         [CultGlobal]
         [CultDocument("tests.group_global", "tests.group_global.v1")]
         [MessagePackObject]
-        public class GroupGlobal
+        public sealed class GroupGlobal
         {
             [Key(0)]
             public string Kind = string.Empty;
         }
 
-        [CultInspectorGroupBy("Kind")]
-        public sealed class GroupGlobalChild : GroupGlobal
-        {
-        }
-
         [CultInspectorGroupBy("Kind")]
         [CultDocument("tests.group_no_ctor", "tests.group_no_ctor.v1")]
         [MessagePackObject]