diff --git a/MapControl/Avalonia/DependencyPropertyHelper.Avalonia.cs b/MapControl/Avalonia/DependencyPropertyHelper.Avalonia.cs
index 371280f6..4ce3d97b 100644
--- a/MapControl/Avalonia/DependencyPropertyHelper.Avalonia.cs
+++ b/MapControl/Avalonia/DependencyPropertyHelper.Avalonia.cs
@@ -33,7 +33,6 @@ namespace MapControl
             TValue defaultValue = default,
             Action<Control, TValue, TValue> changed = null,
             bool inherits = false)
-            where TOwner : AvaloniaObject
         {
             var property = AvaloniaProperty.RegisterAttached<TOwner, Control, TValue>(name, defaultValue, inherits);
 
diff --git a/MapControl/WPF/DependencyPropertyHelper.WPF.cs b/MapControl/WPF/DependencyPropertyHelper.WPF.cs
index 79b30385..ed879683 100644
--- a/MapControl/WPF/DependencyPropertyHelper.WPF.cs
+++ b/MapControl/WPF/DependencyPropertyHelper.WPF.cs
@@ -50,7 +50,6 @@ namespace MapControl
             TValue defaultValue = default,
             Action<FrameworkElement, TValue, TValue> changed = null,
             bool inherits = false)
-            where TOwner : DependencyObject
         {
             var metadata = new FrameworkPropertyMetadata
             {
diff --git a/MapControl/WinUI/DependencyPropertyHelper.WinUI.cs b/MapControl/WinUI/DependencyPropertyHelper.WinUI.cs
index 00c29088..469b2056 100644
--- a/MapControl/WinUI/DependencyPropertyHelper.WinUI.cs
+++ b/MapControl/WinUI/DependencyPropertyHelper.WinUI.cs
@@ -33,7 +33,6 @@ namespace MapControl
             TValue defaultValue = default,
             Action<FrameworkElement, TValue, TValue> changed = null,
             bool inherits = false) // unused in WinUI/UWP
-            where TOwner : DependencyObject
         {
             var metadata = changed != null
                 ? new PropertyMetadata(defaultValue, (o, e) => changed((FrameworkElement)o, (TValue)e.OldValue, (TValue)e.NewValue))