diff --git a/tests/php/test-class-amp-theme-support.php b/tests/php/test-class-amp-theme-support.php
index ef9861578ee..15b7e002859 100644
--- a/tests/php/test-class-amp-theme-support.php
+++ b/tests/php/test-class-amp-theme-support.php
@@ -1205,13 +1205,13 @@ public function test_filter_admin_bar_style_loader_tag( $setup_callback, $assert
 	}
 
 	/**
-	 * Test filter_admin_bar_style_loader_tag when ->deps is not an array.
+	 * Test filter_admin_bar_style_loader_tag when ->deps is an empty array.
 	 *
 	 * @covers \AMP_Theme_Support::filter_admin_bar_style_loader_tag()
 	 */
-	public function test_filter_admin_bar_style_loader_tag_non_array() {
+	public function test_filter_admin_bar_style_loader_tag_empty_array() {
 		wp_enqueue_style( 'admin-bar' );
-		$GLOBALS['wp_styles']->registered['admin-bar']->deps = null;
+		$GLOBALS['wp_styles']->registered['admin-bar']->deps = [];
 		$tag = '<link rel="stylesheet" id="dashicons-css" href="https://example.com/wp-includes/css/dashicons.css?ver=5.3.2" media="all" />'; // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedStylesheet
 		$this->assertEquals( $tag, AMP_Theme_Support::filter_admin_bar_style_loader_tag( $tag, 'baz' ) );
 	}