diff --git a/packages/block-library/src/navigation-submenu/index.php b/packages/block-library/src/navigation-submenu/index.php
index cdb26b93b1b50b..addf5c81c9cb4d 100644
--- a/packages/block-library/src/navigation-submenu/index.php
+++ b/packages/block-library/src/navigation-submenu/index.php
@@ -19,7 +19,7 @@ function block_core_navigation_submenu_build_css_colors( $context, $attributes )
 		'inline_styles' => '',
 	);
 
-	$is_sub_menu = isset( $attributes['isTopLevelLink'] ) ? ( ! $attributes['isTopLevelLink'] ) : false;
+	$is_sub_menu = isset( $attributes['isTopLevelItem'] ) ? ( ! $attributes['isTopLevelItem'] ) : false;
 
 	// Text color.
 	$named_text_color  = null;