diff --git a/src/HierarchyGrid.Avalonia/Grid.axaml.cs b/src/HierarchyGrid.Avalonia/Grid.axaml.cs
index 53d841c..e6e81b2 100644
--- a/src/HierarchyGrid.Avalonia/Grid.axaml.cs
+++ b/src/HierarchyGrid.Avalonia/Grid.axaml.cs
@@ -543,11 +543,7 @@ GridSplitter GetSplitter(int idx)
             .HeadersCoordinates.Where(x => x.Definition.Definition.Count() == 1)
             .ToArray();
 
-        foreach (
-            var c in headers.Where(t =>
-                t.Definition is PositionedDefinition pdef && pdef.Definition is ConsumerDefinition
-            )
-        )
+        foreach (var c in headers.Where(t => t.Definition.Definition is ConsumerDefinition))
         {
             var (coord, def) = c;
             var splitter = GetSplitter(splitterCount++);
diff --git a/src/HierarchyGrid/Grid.xaml.cs b/src/HierarchyGrid/Grid.xaml.cs
index a93e86c..95aa54f 100644
--- a/src/HierarchyGrid/Grid.xaml.cs
+++ b/src/HierarchyGrid/Grid.xaml.cs
@@ -643,7 +643,7 @@ GridSplitter GetSplitter(int idx)
                 .HeadersCoordinates.Where(x => x.Definition.Definition.Count() == 1)
                 .ToArray();
 
-            foreach (var c in headers.Where(t => t.Definition is ConsumerDefinition))
+            foreach (var c in headers.Where(t => t.Definition.Definition is ConsumerDefinition))
             {
                 var (coord, def) = c;
                 var splitter = GetSplitter(splitterCount++);