diff --git a/src/Polyfills/AssertClosedResource.php b/src/Polyfills/AssertClosedResource.php
index 799b6d9..c468386 100644
--- a/src/Polyfills/AssertClosedResource.php
+++ b/src/Polyfills/AssertClosedResource.php
@@ -2,7 +2,8 @@
 
 namespace Yoast\PHPUnitPolyfills\Polyfills;
 
-use PHPUnit\SebastianBergmann\Exporter\Exporter as Exporter_In_Phar;
+use PHPUnit\SebastianBergmann\Exporter\Exporter as Exporter_In_Phar_Old;
+use PHPUnitPHAR\SebastianBergmann\Exporter\Exporter as Exporter_In_Phar;
 use SebastianBergmann\Exporter\Exporter;
 use Yoast\PHPUnitPolyfills\Helpers\ResourceHelper;
 
@@ -25,7 +26,7 @@ trait AssertClosedResource {
 	 * @return void
 	 */
 	public static function assertIsClosedResource( $actual, $message = '' ) {
-		$exporter = \class_exists( 'SebastianBergmann\Exporter\Exporter' ) ? new Exporter() : new Exporter_In_Phar();
+		$exporter = self::getPHPUnitExporterObject();
 		$msg      = \sprintf( 'Failed asserting that %s is of type "resource (closed)"', $exporter->export( $actual ) );
 
 		if ( $message !== '' ) {
@@ -44,7 +45,7 @@ public static function assertIsClosedResource( $actual, $message = '' ) {
 	 * @return void
 	 */
 	public static function assertIsNotClosedResource( $actual, $message = '' ) {
-		$exporter = \class_exists( 'SebastianBergmann\Exporter\Exporter' ) ? new Exporter() : new Exporter_In_Phar();
+		$exporter = self::getPHPUnitExporterObject();
 		$type     = $exporter->export( $actual );
 		if ( $type === 'NULL' ) {
 			$type = 'resource (closed)';
@@ -77,4 +78,23 @@ public static function assertIsNotClosedResource( $actual, $message = '' ) {
 	public static function shouldClosedResourceAssertionBeSkipped( $actual ) {
 		return ( ResourceHelper::isResourceStateReliable( $actual ) === false );
 	}
+
+	/**
+	 * Helper function to obtain an instance of the Exporter class.
+	 *
+	 * @return SebastianBergmann\Exporter\Exporter|PHPUnitPHAR\SebastianBergmann\Exporter\Exporter|PHPUnit\SebastianBergmann\Exporter\Exporter
+	 */
+	private static function getPHPUnitExporterObject() {
+		if ( \class_exists( 'SebastianBergmann\Exporter\Exporter' ) ) {
+			// Composer install or really old PHAR files.
+			return new Exporter();
+		}
+		elseif ( \class_exists( 'PHPUnitPHAR\SebastianBergmann\Exporter\Exporter' ) ) {
+			// PHPUnit PHAR file for 8.5.38+, 9.6.19+, 10.5.17+ and 11.0.10+.
+			return new Exporter_In_Phar();
+		}
+
+		// PHPUnit PHAR file for < 8.5.38, < 9.6.19, < 10.5.17 and < 11.0.10.
+		return new Exporter_In_Phar_Old();
+	}
 }