diff --git a/lib/functions/filedir/function.makeCorrectDir.php b/lib/functions/filedir/function.makeCorrectDir.php
index 4dd3c3d4..d0722812 100644
--- a/lib/functions/filedir/function.makeCorrectDir.php
+++ b/lib/functions/filedir/function.makeCorrectDir.php
@@ -27,7 +27,7 @@
 function makeCorrectDir($dir) {
 
 	if (version_compare("5.4.6", PHP_VERSION, ">")) {
-		assert(is_string($dir) && strlen($dir) > 0);/* $dir does not look like an actual folder name */
+		assert('is_string($dir) && strlen($dir) > 0 /* $dir does not look like an actual folder name */');
 	} else {
 		assert((is_string($dir) && strlen($dir) > 0), 'Value "' . $dir .'" does not look like an actual folder name');
 	}