diff --git a/Project/Src/Gui/GutterMargin.cs b/Project/Src/Gui/GutterMargin.cs
index 9477a27..772a09e 100644
--- a/Project/Src/Gui/GutterMargin.cs
+++ b/Project/Src/Gui/GutterMargin.cs
@@ -42,7 +42,7 @@ namespace ICSharpCode.TextEditor
         public override Cursor Cursor => RightLeftCursor;
 
         public override int Width
-            => textArea.TextView.WideSpaceWidth*Math.Max(4, (int)Math.Log10(textArea.Document.TotalNumberOfLines) + 4);
+            => textArea.TextView.WideSpaceWidth * (2 * (int)Math.Log10(textArea.Document.TotalNumberOfLines) + 3) / 2;
 
         public override bool IsVisible => textArea.TextEditorProperties.ShowLineNumbers;