diff --git a/tests/phpunit/suites/ExtensionsUnitTestSuite.php b/tests/phpunit/suites/ExtensionsUnitTestSuite.php
index eed59a6746c..bd8ed45fd7f 100644
--- a/tests/phpunit/suites/ExtensionsUnitTestSuite.php
+++ b/tests/phpunit/suites/ExtensionsUnitTestSuite.php
@@ -13,20 +13,11 @@ class ExtensionsUnitTestSuite extends TestSuite {
 		if ( !defined( 'MW_PHPUNIT_EXTENSIONS_PATHS' ) ) {
 			throw new RuntimeException( 'The PHPUnit bootstrap was not loaded' );
 		}
-		$paths = [];
+
+		$suffixes = [ 'Test.php' ];
+		$fileIterator = new Facade();
 		foreach ( MW_PHPUNIT_EXTENSIONS_PATHS as $path ) {
-			// Note that we don't load settings, so we expect to find extensions in their
-			// default location
-			// Standardize directory separators for Windows compatibility.
-			if ( str_contains( strtr( $path, '\\', '/' ), '/extensions/' ) ) {
-				$paths[] = "$path/tests/phpunit/unit";
-			}
-		}
-		foreach ( array_unique( $paths ) as $path ) {
-			$suffixes = [ 'Test.php' ];
-			$fileIterator = new Facade();
-			$matchingFiles = $fileIterator->getFilesAsArray( $path, $suffixes );
-			$this->addTestFiles( $matchingFiles );
+			$this->addTestFiles( $fileIterator->getFilesAsArray( "$path/tests/phpunit/unit", $suffixes ) );
 		}
 	}