diff --git a/src/Avalonia.Controls/Automation/Peers/RadioButtonAutomationPeer.cs b/src/Avalonia.Controls/Automation/Peers/RadioButtonAutomationPeer.cs
index ea4e37adba..b7b7adfd52 100644
--- a/src/Avalonia.Controls/Automation/Peers/RadioButtonAutomationPeer.cs
+++ b/src/Avalonia.Controls/Automation/Peers/RadioButtonAutomationPeer.cs
@@ -13,7 +13,7 @@ namespace Avalonia.Controls.Automation.Peers
             {
                 if (e.Property == RadioButton.IsCheckedProperty)
                 {
-                    RaiseToggleStatePropertyChangedEvent((bool)e.OldValue, (bool)e.NewValue);
+                    RaiseToggleStatePropertyChangedEvent((bool?)e.OldValue, (bool?)e.NewValue);
                 }
                 
             };