diff --git a/core/modules/simpletest/simpletest.module b/core/modules/simpletest/simpletest.module
index 1ecc40f..bb480f6 100644
--- a/core/modules/simpletest/simpletest.module
+++ b/core/modules/simpletest/simpletest.module
@@ -2,6 +2,7 @@
 
 use Drupal\Core\Database\Database;
 use Drupal\simpletest\TestBase;
+use Symfony\Component\Process\PhpExecutableFinder;
 
 /**
  * @file
@@ -240,6 +241,12 @@ function simpletest_phpunit_configuration_filepath() {
 function simpletest_phpunit_run_command(array $unescaped_test_classnames, $phpunit_file) {
   $phpunit_bin = DRUPAL_ROOT . "/core/vendor/bin/phpunit";
 
+  if (substr(PHP_OS, 0, 3) == 'WIN') {
+    $php_executable_finder = new PhpExecutableFinder();
+    $php = $php_executable_finder->find();
+    $phpunit_bin = escapeshellarg($php) . " -f " . escapeshellarg(DRUPAL_ROOT . "/core/vendor/phpunit/phpunit/composer/bin/phpunit") . " --";
+  }
+
   // Double escape namespaces so they'll work in a regexp.
   $escaped_test_classnames = array_map(function($class) {
     return addslashes($class);