diff --git a/kcmkwin/kwindecoration/package/contents/ui/Themes.qml b/kcmkwin/kwindecoration/package/contents/ui/Themes.qml
index 67a9e44779ec2741dc17e1b9f483699eccccbf59..17b573dce634ef335311c434c10a41384d4af196 100644
--- a/kcmkwin/kwindecoration/package/contents/ui/Themes.qml
+++ b/kcmkwin/kwindecoration/package/contents/ui/Themes.qml
@@ -43,6 +43,9 @@ KCM.GridView {
             KDecoration.Settings {
                 id: settingsItem
                 bridge: bridgeItem.bridge
+                Component.onCompleted: {
+                    settingsItem.borderSizesIndex = kcm.borderSize
+                }
             }
             KDecoration.Decoration {
                 id: inactivePreview