diff --git a/src/HierarchyGrid.Definitions/HierarchyGridViewModel.cs b/src/HierarchyGrid.Definitions/HierarchyGridViewModel.cs
index dbde2a3..8b4de9c 100644
--- a/src/HierarchyGrid.Definitions/HierarchyGridViewModel.cs
+++ b/src/HierarchyGrid.Definitions/HierarchyGridViewModel.cs
@@ -946,7 +946,8 @@ internal void HandleMouseLeft()
         {
             HoveredCell = Option<PositionedCell>.None;
             HoveredElementId = Guid.Empty;
-            Observable.Return(RxUnit.Default).InvokeCommand(CloseTooltip);
+            HoveredDefinitionHeader = Option<PositionedDefinition>.None;
+
             ClearCrosshair();
         }