diff --git a/PartPreviewWindow/RoundedToggleSwitch.cs b/PartPreviewWindow/RoundedToggleSwitch.cs
index ae013a8ca..09e4a1d5d 100644
--- a/PartPreviewWindow/RoundedToggleSwitch.cs
+++ b/PartPreviewWindow/RoundedToggleSwitch.cs
@@ -60,8 +60,11 @@ namespace MatterHackers.MatterControl.CustomWidgets
 			get => _checked;
 			set
 			{
-				_checked = value;
-				this.Invalidate();
+				if (_checked != value)
+				{
+					_checked = value;
+					this.Invalidate();
+				}
 			}
 		}