diff --git a/src/Avalonia.Controls/Primitives/Popup.cs b/src/Avalonia.Controls/Primitives/Popup.cs
index c548d107a1..63f3fb647b 100644
--- a/src/Avalonia.Controls/Primitives/Popup.cs
+++ b/src/Avalonia.Controls/Primitives/Popup.cs
@@ -68,6 +68,7 @@ namespace Avalonia.Controls.Primitives
         private PopupRoot _popupRoot;
         private TopLevel _topLevel;
         private IDisposable _nonClientListener;
+        bool _ignoreIsOpenChanged = false;
 
         /// <summary>
         /// Initializes static members of the <see cref="Popup"/> class.
@@ -182,8 +183,6 @@ namespace Avalonia.Controls.Primitives
         /// </summary>
         IVisual IVisualTreeHost.Root => _popupRoot;
 
-        bool _ignoreIsOpenChanged = false;
-
         /// <summary>
         /// Opens the popup.
         /// </summary>