diff --git a/reference/filesystem/functions/fwrite.xml b/reference/filesystem/functions/fwrite.xml
index 00f01dd94e..956e065b24 100644
--- a/reference/filesystem/functions/fwrite.xml
+++ b/reference/filesystem/functions/fwrite.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.8 $ -->
+<!-- $Revision: 1.9 $ -->
 <!-- splitted from ./en/functions/filesystem.xml, last change in rev 1.2 -->
   <refentry id="function.fwrite">
    <refnamediv>
@@ -62,7 +62,7 @@ if (is_writable($filename)) {
     }
 
     // Write $somecontent to our opened file.
-    if (!fwrite($handle, $somecontent)) {
+    if (fwrite($handle, $somecontent) === FALSE) {
         echo "Cannot write to file ($filename)";
         exit;
     }