diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 0663d0cf85..588a060630 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -994,6 +994,14 @@ function phpbb_own_realpath($path)
 		$resolved .= $bit . (($i == $max) ? '' : '/');
 	}
 
+	// @todo If the file exists fine and open_basedir only has one path we should be able to prepend it
+	// because we must be inside that basedir, the question is where...
+	// @internal The slash in is_dir() gets around an open_basedir restriction
+	if (!@file_exists($resolved) || (!@is_dir($resolved . '/') && !is_file($resolved)))
+	{
+		return false;
+	}
+
 	// Put the slashes back to the native operating systems slashes
 	$resolved = str_replace('/', DIRECTORY_SEPARATOR, $resolved);