diff --git a/flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLightLaf.properties b/flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLightLaf.properties
index c7f41c69..ffc9c45b 100644
--- a/flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLightLaf.properties
+++ b/flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLightLaf.properties
@@ -254,7 +254,7 @@ RadioButton.icon[filled].centerDiameter=5
 #---- RootPane ----
 
 RootPane.activeBorderColor=#707070
-RootPane.inactiveBorderColor=lighten($RootPane.activeBorderColor,20%)
+RootPane.inactiveBorderColor=lighten($RootPane.activeBorderColor,20%,derived)
 
 
 #---- ScrollBar ----
diff --git a/flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/uidefaults/FlatLightLaf_1.8.0_202.txt b/flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/uidefaults/FlatLightLaf_1.8.0_202.txt
index 7f24a06f..cec22988 100644
--- a/flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/uidefaults/FlatLightLaf_1.8.0_202.txt
+++ b/flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/uidefaults/FlatLightLaf_1.8.0_202.txt
@@ -773,7 +773,7 @@ RootPane.defaultButtonWindowKeyBindings length=8    [Ljava.lang.Object;
     [7] release
 RootPane.honorDialogMinimumSizeOnResize true
 RootPane.honorFrameMinimumSizeOnResize false
-RootPane.inactiveBorderColor   #a3a3a3    javax.swing.plaf.ColorUIResource [UI]
+RootPane.inactiveBorderColor   #a3a3a3    com.formdev.flatlaf.util.DerivedColor [UI]    lighten(20% autoInverse)
 RootPaneUI                     com.formdev.flatlaf.ui.FlatRootPaneUI