diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10420b8f..3703f269 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ FlatLaf Change Log
   (issue #275)
 - Custom window decorations: Fixed right aligned progress bar in embedded menu
   bar was overlapping window title. (issue #272)
+- Fixed missing focus indicators in heavy-weight popups. (issue #273)
 - InternalFrame: Fixed translucent internal frame menu bar background if
   `TitlePane.unifiedBackground` is `true`. (issue #274)
 
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatUIUtils.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatUIUtils.java
index 59ae3446..f9476443 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatUIUtils.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatUIUtils.java
@@ -185,7 +185,8 @@ public class FlatUIUtils
 
 	/**
 	 * Returns whether the given component is the permanent focus owner and
-	 * is in the active window. Used to paint focus indicators.
+	 * is in the active window or in a popup window owned by the active window.
+	 * Used to paint focus indicators.
 	 */
 	@SuppressWarnings( "unchecked" )
 	public static boolean isPermanentFocusOwner( Component c ) {
@@ -195,12 +196,18 @@ public class FlatUIUtils
 			Object value = ((JComponent)c).getClientProperty( FlatClientProperties.COMPONENT_FOCUS_OWNER );
 			if( value instanceof Predicate ) {
 				return ((Predicate<JComponent>)value).test( (JComponent) c ) &&
-					keyboardFocusManager.getActiveWindow() == SwingUtilities.windowForComponent( c );
+					isInActiveWindow( c, keyboardFocusManager.getActiveWindow() );
 			}
 		}
 
 		return keyboardFocusManager.getPermanentFocusOwner() == c &&
-			keyboardFocusManager.getActiveWindow() == SwingUtilities.windowForComponent( c );
+			isInActiveWindow( c, keyboardFocusManager.getActiveWindow() );
+	}
+
+	private static boolean isInActiveWindow( Component c, Window activeWindow ) {
+		Window window = SwingUtilities.windowForComponent( c );
+		return window == activeWindow ||
+			(window != null && window.getType() == Window.Type.POPUP && window.getOwner() == activeWindow);
 	}
 
 	/**