diff --git a/phpBB/develop/namespacify.php b/phpBB/develop/namespacify.php
index b6414d57a4..d2dd5f24a6 100644
--- a/phpBB/develop/namespacify.php
+++ b/phpBB/develop/namespacify.php
@@ -20,10 +20,10 @@
 //
 die("Please read the first lines of this script for instructions on how to enable it");
 
-$namespace_dir = __DIR__ . '/../phpbb/';
-$code_dir = __DIR__ . '/../';
-$test_dir = __DIR__ . '/../../tests/';
-$config_dir = __DIR__ . '/../config/';
+$namespace_dir = realpath(__DIR__ . '/../phpbb/');
+$code_dir = realpath(__DIR__ . '/../');
+$test_dir = realpath(__DIR__ . '/../../tests/');
+$config_dir = realpath(__DIR__ . '/../config/');
 
 function map_class_name($old_class_name, $code_dir)
 {
diff --git a/phpBB/develop/rename_interfaces.php b/phpBB/develop/rename_interfaces.php
index f0dcf0be96..90bf9cc205 100644
--- a/phpBB/develop/rename_interfaces.php
+++ b/phpBB/develop/rename_interfaces.php
@@ -20,8 +20,8 @@
 //
 die("Please read the first lines of this script for instructions on how to enable it");
 
-$code_dir = __DIR__ . '/../';
-$test_dir = __DIR__ . '/../../tests/';
+$code_dir = realpath(__DIR__ . '/../');
+$test_dir = realpath(__DIR__ . '/../../tests/');
 $iterator = new \AppendIterator();
 $iterator->append(new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($code_dir)));
 $iterator->append(new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($test_dir)));
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 1206f42caf..14640d6c52 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -3240,12 +3240,12 @@ function phpbb_filter_root_path($errfile)
 	{
 		if ($phpbb_filesystem)
 		{
-			$root_path = $phpbb_filesystem-> __DIR__ . '/../';
+			$root_path = $phpbb_filesystem-> realpath(__DIR__ . '/../');
 		}
 		else
 		{
 			$filesystem = new \phpbb\filesystem\filesystem();
-			$root_path = $filesystem-> __DIR__ . '/../';
+			$root_path = $filesystem-> realpath(__DIR__ . '/../');
 		}
 	}