diff --git a/MatterControlLib/CustomWidgets/NozzleOffsetCalibrationPage.cs b/MatterControlLib/CustomWidgets/NozzleOffsetCalibrationPage.cs
index a1c02af32..7e45cca02 100644
--- a/MatterControlLib/CustomWidgets/NozzleOffsetCalibrationPage.cs
+++ b/MatterControlLib/CustomWidgets/NozzleOffsetCalibrationPage.cs
@@ -488,7 +488,7 @@ namespace MatterHackers.MatterControl
 			nextButton.Click += (s, e) =>
 			{
 				var hotendOffset = printer.Settings.Helpers.ExtruderOffset(1);
-				hotendOffset.X = double.Parse(activeOffset.Text);
+				hotendOffset.X += double.Parse(activeOffset.Text);
 				printer.Settings.Helpers.SetExtruderOffset(1, hotendOffset);
 			};