diff --git a/functions/strings.xml b/functions/strings.xml
index f9da37256c..1bf7ab53b9 100644
--- a/functions/strings.xml
+++ b/functions/strings.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.136 $ -->
+<!-- $Revision: 1.137 $ -->
  <reference id="ref.strings">
   <title>String functions</title>
   <titleabbrev>Strings</titleabbrev>
@@ -3017,7 +3017,7 @@ if ($pos === false) { // note: three equal signs
 
 // in versions older than 4.0b3:
 $pos = strpos($mystring, "b");
-if (is_string($pos) && !$pos) {
+if (!is_integer($pos)) {
     // not found...
 }
 ]]>