diff --git a/includes/file.inc b/includes/file.inc
index 2f17d622449f75911e019eadc3eb5be3edc07226..bf14efba9f69f1404314cff54ee9fbf6cfc3b380 100644
--- a/includes/file.inc
+++ b/includes/file.inc
@@ -992,7 +992,7 @@ function file_scan_directory($dir, $mask, $nomask = array('.', '..', 'CVS'), $ca
   $files = array();
 
   if (is_dir($dir) && $handle = opendir($dir)) {
-    while (false !== ($file = readdir($handle))) {
+    while (FALSE !== ($file = readdir($handle))) {
       if (!in_array($file, $nomask) && $file[0] != '.') {
         if (is_dir("$dir/$file") && $recurse) {
           // Give priority to files in this folder by merging them in after any subdirectory files.