diff --git a/Pilz.UI/PaintingControl/PaintingControl.vb b/Pilz.UI/PaintingControl/PaintingControl.vb
index 0de9a3c..e1a7890 100644
--- a/Pilz.UI/PaintingControl/PaintingControl.vb
+++ b/Pilz.UI/PaintingControl/PaintingControl.vb
@@ -644,7 +644,7 @@ Public Class PaintingControl
     End Sub
 
     Private Sub CheckMouseWheel(sender As Object, e As MouseEventArgs) Handles Me.MouseWheel
-        If pressedControl Then
+        If pressedAlt Then
             Dim val As Single = e.Delta / 120 / 10
             ZoomFactor = New SizeF(Math.Max(ZoomFactor.Width + val, 0.25), Math.Max(ZoomFactor.Height + val, 0.25))
             Refresh()