diff --git a/Elwig/Controls/IntegerUpDown.xaml b/Elwig/Controls/IntegerUpDown.xaml
index bda2c84..452bb8e 100644
--- a/Elwig/Controls/IntegerUpDown.xaml
+++ b/Elwig/Controls/IntegerUpDown.xaml
@@ -21,7 +21,7 @@
                             <ScrollViewer x:Name="PART_ContentHost" VerticalAlignment="Center"/>
                         </Border>
 
-                        <RepeatButton x:Name="IncrementButton" Padding="0" Height="Auto" Width="Auto" BorderThickness="1,1,1,0"
+                        <RepeatButton x:Name="IncrementButton" Padding="0" Height="Auto" Width="Auto" BorderThickness="1,1,1,1"
                                 HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Row="0" Grid.Column="1">
                             <Path x:Name="IconIncrement" Data="M 0,4 L 4,0 L 8,4 Z" Fill="#FF444444"
                                   HorizontalAlignment="Center" VerticalAlignment="Center"/>