diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
index c9434274..59576d14 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
@@ -646,7 +646,7 @@ class UIDefaultsLoader
 				: 1f;
 			int arc = (parts.size() >= 7) && !parts.get( 6 ).isEmpty()
 				? parseInteger( parts.get( 6 ) )
-				: 0;
+				: -1;
 
 			return (LazyValue) t -> {
 				return (lineColor != null || arc > 0)
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLineBorder.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLineBorder.java
index cec6fd42..1ec34129 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLineBorder.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLineBorder.java
@@ -23,6 +23,9 @@ import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
 import javax.swing.JComponent;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.plaf.ComponentUI;
 
 /**
  * Line border for various components.
@@ -45,7 +48,7 @@ public class FlatLineBorder
 	/** @since 2 */ private final int arc;
 
 	public FlatLineBorder( Insets insets, Color lineColor ) {
-		this( insets, lineColor, 1f, 0 );
+		this( insets, lineColor, 1f, -1 );
 	}
 
 	/** @since 2 */
@@ -92,11 +95,26 @@ public class FlatLineBorder
 		if( lineColor == null || lineThickness <= 0 )
 			return;
 
+		int arc = getArc();
+		if( arc < 0 ) {
+			// get arc from label or panel
+			ComponentUI ui = (c instanceof JLabel)
+				? ((JLabel)c).getUI()
+				: (c instanceof JPanel ? ((JPanel)c).getUI() : null);
+			if( ui instanceof FlatLabelUI )
+				arc = ((FlatLabelUI)ui).arc;
+			else if( ui instanceof FlatPanelUI )
+				arc = ((FlatPanelUI)ui).arc;
+
+			if( arc < 0 )
+				arc = 0;
+		}
+
 		Graphics2D g2 = (Graphics2D) g.create();
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 			FlatUIUtils.paintOutlinedComponent( g2, x, y, width, height,
-				0, 0, 0, scale( lineThickness ), scale( getArc() ), null, lineColor, null );
+				0, 0, 0, scale( lineThickness ), scale( arc ), null, lineColor, null );
 		} finally {
 			g2.dispose();
 		}
diff --git a/flatlaf-core/src/test/java/com/formdev/flatlaf/TestUIDefaultsLoader.java b/flatlaf-core/src/test/java/com/formdev/flatlaf/TestUIDefaultsLoader.java
index a303f31b..798daa9a 100644
--- a/flatlaf-core/src/test/java/com/formdev/flatlaf/TestUIDefaultsLoader.java
+++ b/flatlaf-core/src/test/java/com/formdev/flatlaf/TestUIDefaultsLoader.java
@@ -86,7 +86,7 @@ public class TestUIDefaultsLoader
 		assertBorderEquals( new FlatEmptyBorder( insets ), "1,2,3,4" );
 		assertBorderEquals( new FlatEmptyBorder( insets ), "1,2,3,4,,," );
 		assertBorderEquals( new FlatLineBorder( insets, Color.red ), "1,2,3,4,#f00" );
-		assertBorderEquals( new FlatLineBorder( insets, Color.red, 2.5f, 0 ), "1,2,3,4,#f00,2.5" );
+		assertBorderEquals( new FlatLineBorder( insets, Color.red, 2.5f, -1 ), "1,2,3,4,#f00,2.5" );
 		assertBorderEquals( new FlatLineBorder( insets, Color.red, 2.5f, 6 ), "1,2,3,4,#f00,2.5,6" );
 		assertBorderEquals( new FlatLineBorder( insets, Color.red, 1, 6 ), "1,2,3,4,#f00,,6" );
 		assertBorderEquals( new FlatLineBorder( insets, null, 1, 6 ), "1,2,3,4,,,6" );
diff --git a/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.java b/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.java
index 5a19d4c7..2728226c 100644
--- a/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.java
+++ b/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.java
@@ -553,7 +553,7 @@ class MoreComponentsPanel
 
 		//---- label10 ----
 		label10.setText("rounded border");
-		label10.putClientProperty("FlatLaf.style", "border: 2,10,2,10,#135b76,1,999");
+		label10.putClientProperty("FlatLaf.style", "arc: 999; border: 2,10,2,10,#135b76");
 		label10.setBackground(new Color(0xb8e4f3));
 		label10.setForeground(new Color(0x135b76));
 		add(label10, "cell 1 13 4 1");
diff --git a/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.jfd b/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.jfd
index 9c7a2945..5cd05c76 100644
--- a/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.jfd
+++ b/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.jfd
@@ -517,7 +517,7 @@ new FormModel {
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "label10"
 				"text": "rounded border"
-				"$client.FlatLaf.style": "border: 2,10,2,10,#135b76,1,999"
+				"$client.FlatLaf.style": "arc: 999; border: 2,10,2,10,#135b76"
 				"background": new java.awt.Color( 184, 228, 243, 255 )
 				"foreground": new java.awt.Color( 19, 91, 118, 255 )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {