Disabling password box when check box is unchecked

I am trying to make it so that when I have a check box unchecked, it enables my text box and my password box. If my check box is checked, then it should disable my text box and my password box.

Currently it's working exactly opposite of that. Checking the box is making the text box and password box enabled and unchecking the box is making the text box and password box disabled. Is there a way to negate my binding path? Something like Path=!IsChecked?

<TextBlock Text="Trusted Connection:" Grid.Row="4" Grid.Column="0" HorizontalAlignment="Right" Margin="0,0,5,0" VerticalAlignment="Center"></TextBlock>
<CheckBox Grid.Row="4" Grid.Column="1" Margin="0,0,5,0" VerticalAlignment="Center" x:Name="SqlServerTrustedConnection" />

<TextBlock Text="User Name:" Grid.Row="5" Grid.Column="0" HorizontalAlignment="Right" Margin="0,0,5,0" VerticalAlignment="Center"></TextBlock>
<TextBox Grid.Row="5" Grid.Column="1" Margin="0,5,5,0" x:Name="SqlServerUsername" IsEnabled="{Binding Path=IsChecked, ElementName=SqlServerTrustedConnection}"/>

<TextBlock Text="Password:" Grid.Row="6" Grid.Column="0" HorizontalAlignment="Right" Margin="0,0,5,0" VerticalAlignment="Center"></TextBlock>
<PasswordBox Grid.Row="6" Grid.Column="1" Margin="0,5,5,0" x:Name="SqlServerPassword" IsEnabled="{Binding Path=IsChecked, ElementName=SqlServerTrustedConnection}" />