diff --git a/src/Mustache/Autoloader.php b/src/Mustache/Autoloader.php
index 5858262..63c3b52 100644
--- a/src/Mustache/Autoloader.php
+++ b/src/Mustache/Autoloader.php
@@ -19,16 +19,16 @@ class Mustache_Autoloader {
 	/**
 	 * Autoloader constructor.
 	 *
-	 * @param string $baseDir Mustache library base directory (default: __DIR__.'/..')
+	 * @param string $baseDir Mustache library base directory (default: dirname(__FILE__).'/..')
 	 */
 	public function __construct($baseDir = null) {
-		$this->baseDir = rtrim($baseDir, '/') ?: __DIR__.'/..';
+		$this->baseDir = rtrim($baseDir, '/') ?: dirname(__FILE__).'/..';
 	}
 
 	/**
 	 * Register a new instance as an SPL autoloader.
 	 *
-	 * @param string $baseDir Mustache library base directory (default: __DIR__.'/..')
+	 * @param string $baseDir Mustache library base directory (default: dirname(__FILE__).'/..')
 	 *
 	 * @return Mustache_Autoloader Registered Autoloader instance
 	 */
diff --git a/src/Mustache/Loader/FilesystemLoader.php b/src/Mustache/Loader/FilesystemLoader.php
index 28ed564..ecb98c8 100644
--- a/src/Mustache/Loader/FilesystemLoader.php
+++ b/src/Mustache/Loader/FilesystemLoader.php
@@ -14,14 +14,14 @@
  *
  * An ArrayLoader instance loads Mustache Template source from the filesystem by name:
  *
- *     $loader = new FilesystemLoader(__DIR__.'/views');
- *     $tpl = $loader->load('foo'); // equivalent to `file_get_contents(__DIR__.'/views/foo.mustache');
+ *     $loader = new FilesystemLoader(dirname(__FILE__).'/views');
+ *     $tpl = $loader->load('foo'); // equivalent to `file_get_contents(dirname(__FILE__).'/views/foo.mustache');
  *
  * This is probably the most useful Mustache Loader implementation. It can be used for partials and normal Templates:
  *
  *     $m = new Mustache(array(
- *          'loader'          => new FilesystemLoader(__DIR__.'/views'),
- *          'partials_loader' => new FilesystemLoader(__DIR__.'/views/partials'),
+ *          'loader'          => new FilesystemLoader(dirname(__FILE__).'/views'),
+ *          'partials_loader' => new FilesystemLoader(dirname(__FILE__).'/views/partials'),
  *     ));
  *
  * @implements Loader
@@ -61,7 +61,7 @@ class Mustache_Loader_FilesystemLoader implements Mustache_Loader {
 	/**
 	 * Load a Template by name.
 	 *
-	 *     $loader = new FilesystemLoader(__DIR__.'/views');
+	 *     $loader = new FilesystemLoader(dirname(__FILE__).'/views');
 	 *     $loader->load('admin/dashboard'); // loads "./views/admin/dashboard.mustache";
 	 *
 	 * @param string $name
diff --git a/src/Mustache/Mustache.php b/src/Mustache/Mustache.php
index 472c6bb..1859d34 100644
--- a/src/Mustache/Mustache.php
+++ b/src/Mustache/Mustache.php
@@ -47,17 +47,17 @@ class Mustache_Mustache {
 	 *         'template_class_prefix' => '__MyTemplates_',
 	 *
 	 *         // A cache directory for compiled templates. Mustache will not cache templates unless this is set
-	 *         'cache' => __DIR__.'/tmp/cache/mustache',
+	 *         'cache' => dirname(__FILE__).'/tmp/cache/mustache',
 	 *
 	 *         // A Mustache template loader instance. Uses a StringLoader if not specified
-	 *         'loader' => new Mustache_Loader_FilesystemLoader(__DIR__.'/views'),
+	 *         'loader' => new Mustache_Loader_FilesystemLoader(dirname(__FILE__).'/views'),
 	 *
 	 *         // A Mustache loader instance for partials.
-	 *         'partials_loader' => new Mustache_Loader_FilesystemLoader(__DIR__.'/views/partials'),
+	 *         'partials_loader' => new Mustache_Loader_FilesystemLoader(dirname(__FILE__).'/views/partials'),
 	 *
 	 *         // An array of Mustache partials. Useful for quick-and-dirty string template loading, but not as
 	 *         // efficient or lazy as a Filesystem (or database) loader.
-	 *         'partials' => array('foo' => file_get_contents(__DIR__.'/views/partials/foo.mustache')),
+	 *         'partials' => array('foo' => file_get_contents(dirname(__FILE__).'/views/partials/foo.mustache')),
 	 *
 	 *         // An array of 'helpers'. Helpers can be global variables or objects, closures (e.g. for higher order
 	 *         // sections), or any other valid Mustache context value. They will be prepended to the context stack,
diff --git a/test/Mustache/Test/AutoloaderTest.php b/test/Mustache/Test/AutoloaderTest.php
index 9a4a358..4743e01 100644
--- a/test/Mustache/Test/AutoloaderTest.php
+++ b/test/Mustache/Test/AutoloaderTest.php
@@ -19,7 +19,7 @@ class Mustache_Test_AutoloaderTest extends PHPUnit_Framework_TestCase {
 	}
 
 	public function testAutoloader() {
-		$loader = new Mustache_Autoloader(__DIR__.'/../../fixtures/autoloader');
+		$loader = new Mustache_Autoloader(dirname(__FILE__).'/../../fixtures/autoloader');
 
 		$this->assertNull($loader->autoload('NonMustacheClass'));
 		$this->assertFalse(class_exists('NonMustacheClass'));
diff --git a/test/Mustache/Test/Functional/ExamplesTest.php b/test/Mustache/Test/Functional/ExamplesTest.php
index 46d6bd0..52fdbe1 100644
--- a/test/Mustache/Test/Functional/ExamplesTest.php
+++ b/test/Mustache/Test/Functional/ExamplesTest.php
@@ -46,7 +46,7 @@ class Mustache_Test_Functional_ExamplesTest extends PHPUnit_Framework_TestCase {
 	 * @return array
 	 */
 	public function getExamples() {
-		$path     = realpath(__DIR__.'/../../../../examples');
+		$path     = realpath(dirname(__FILE__).'/../../../../examples');
 		$examples = array();
 
 		$handle   = opendir($path);
diff --git a/test/Mustache/Test/Functional/MustacheSpecTest.php b/test/Mustache/Test/Functional/MustacheSpecTest.php
index 2343fbd..e10d60c 100644
--- a/test/Mustache/Test/Functional/MustacheSpecTest.php
+++ b/test/Mustache/Test/Functional/MustacheSpecTest.php
@@ -28,7 +28,7 @@ class Mustache_Test_Functional_MustacheSpecTest extends PHPUnit_Framework_TestCa
 	 * simply to provide a 'skipped' test if the `spec` submodule isn't initialized.
 	 */
 	public function testSpecInitialized() {
-		if (!file_exists(__DIR__.'/../../../../vendor/spec/specs/')) {
+		if (!file_exists(dirname(__FILE__).'/../../../../vendor/spec/specs/')) {
 			$this->markTestSkipped('Mustache spec submodule not initialized: run "git submodule update --init"');
 		}
 	}
@@ -156,7 +156,7 @@ class Mustache_Test_Functional_MustacheSpecTest extends PHPUnit_Framework_TestCa
 	 * @return array
 	 */
 	private function loadSpec($name) {
-		$filename = __DIR__ . '/../../../../vendor/spec/specs/' . $name . '.yml';
+		$filename = dirname(__FILE__) . '/../../../../vendor/spec/specs/' . $name . '.yml';
 		if (!file_exists($filename)) {
 			return array();
 		}
diff --git a/test/Mustache/Test/Loader/FilesystemLoaderTest.php b/test/Mustache/Test/Loader/FilesystemLoaderTest.php
index e158b45..b01b805 100644
--- a/test/Mustache/Test/Loader/FilesystemLoaderTest.php
+++ b/test/Mustache/Test/Loader/FilesystemLoaderTest.php
@@ -14,14 +14,14 @@
  */
 class Mustache_Test_Loader_FilesystemLoaderTest extends PHPUnit_Framework_TestCase {
 	public function testConstructor() {
-		$baseDir = realpath(__DIR__.'/../../../fixtures/templates');
+		$baseDir = realpath(dirname(__FILE__).'/../../../fixtures/templates');
 		$loader = new Mustache_Loader_FilesystemLoader($baseDir, array('extension' => '.ms'));
 		$this->assertEquals('alpha contents', $loader->load('alpha'));
 		$this->assertEquals('beta contents', $loader->load('beta.ms'));
 	}
 
 	public function testLoadTemplates() {
-		$baseDir = realpath(__DIR__.'/../../../fixtures/templates');
+		$baseDir = realpath(dirname(__FILE__).'/../../../fixtures/templates');
 		$loader = new Mustache_Loader_FilesystemLoader($baseDir);
 		$this->assertEquals('one contents', $loader->load('one'));
 		$this->assertEquals('two contents', $loader->load('two.mustache'));
@@ -31,14 +31,14 @@ class Mustache_Test_Loader_FilesystemLoaderTest extends PHPUnit_Framework_TestCa
 	 * @expectedException \RuntimeException
 	 */
 	public function testMissingBaseDirThrowsException() {
-		$loader = new Mustache_Loader_FilesystemLoader(__DIR__.'/not_a_directory');
+		$loader = new Mustache_Loader_FilesystemLoader(dirname(__FILE__).'/not_a_directory');
 	}
 
 	/**
 	 * @expectedException \InvalidArgumentException
 	 */
 	public function testMissingTemplateThrowsException() {
-		$baseDir = realpath(__DIR__.'/../../../fixtures/templates');
+		$baseDir = realpath(dirname(__FILE__).'/../../../fixtures/templates');
 		$loader = new Mustache_Loader_FilesystemLoader($baseDir);
 
 		$loader->load('fake');
diff --git a/test/bootstrap.php b/test/bootstrap.php
index fd1386a..91f654a 100644
--- a/test/bootstrap.php
+++ b/test/bootstrap.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-require __DIR__.'/../src/Mustache/Autoloader.php';
+require dirname(__FILE__).'/../src/Mustache/Autoloader.php';
 Mustache_Autoloader::register();
 
-require __DIR__.'/../vendor/yaml/lib/sfYamlParser.php';
+require dirname(__FILE__).'/../vendor/yaml/lib/sfYamlParser.php';