diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuBarUI.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuBarUI.java
index f17053e7..67a67e3e 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuBarUI.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuBarUI.java
@@ -104,8 +104,9 @@ public class FlatMenuBarUI
 
 		// do not paint background for unified title pane
 		// (not storing value of "TitlePane.unifiedBackground" in class to allow changing at runtime)
-		if( UIManager.getBoolean( "TitlePane.unifiedBackground" ) )
-			return false;
+		if( UIManager.getBoolean( "TitlePane.unifiedBackground" ) &&
+			FlatNativeWindowBorder.hasCustomDecoration( (Window) rootPane.getParent() ) )
+		  return false;
 
 		// paint background in full screen mode
 		if( FlatUIUtils.isFullScreen( rootPane ) )