diff --git a/Elwig/Windows/BaseDataWindow.xaml b/Elwig/Windows/BaseDataWindow.xaml
index 0f0ebdb..f6a1997 100644
--- a/Elwig/Windows/BaseDataWindow.xaml
+++ b/Elwig/Windows/BaseDataWindow.xaml
@@ -102,7 +102,7 @@
                     <Label Content="UID:"
                            VerticalAlignment="Top" HorizontalAlignment="Left" Grid.Column="2" Margin="10,100,0,10"/>
                     <TextBox x:Name="ClientUstIdNrInput"
-                             VerticalAlignment="Top" HorizontalAlignment="Left" Grid.Column="3" Margin="0,100,10,10" Width="120"
+                             VerticalAlignment="Top" HorizontalAlignment="Left" Grid.Column="3" Margin="0,100,10,10" Width="96"
                              TextChanged="UstIdNrInput_TextChanged" LostFocus="UstIdNrInput_LostFocus"/>
 
                     <Label Content="Betriebs-Nr.:"
diff --git a/Elwig/Windows/MemberAdminWindow.xaml b/Elwig/Windows/MemberAdminWindow.xaml
index 3633580..c51a05c 100644
--- a/Elwig/Windows/MemberAdminWindow.xaml
+++ b/Elwig/Windows/MemberAdminWindow.xaml
@@ -262,7 +262,7 @@
                 </Grid.ColumnDefinitions>
 
                 <Label Content="UID:" Margin="10,10,0,0" Grid.Column="0"/>
-                <TextBox x:Name="UstIdNrInput" Margin="0,10,10,0" Grid.Column="1" Width="120" HorizontalAlignment="Left"
+                <TextBox x:Name="UstIdNrInput" Margin="0,10,10,0" Grid.Column="1" Width="96" HorizontalAlignment="Left"
                          TextChanged="UstIdNrInput_TextChanged" LostFocus="UstIdNrInput_LostFocus"/>
 
                 <Label Content="Betriebs-Nr.:" Margin="10,40,0,0" Grid.Column="0"/>