diff --git a/htdocs/lib/functions.lib.php b/htdocs/lib/functions.lib.php
index 5a658016a0b3d196438b3c90ff0750ce8caf71d0..388988198fbb8a17b5b7bc696ef5c8500d8a9f2d 100644
--- a/htdocs/lib/functions.lib.php
+++ b/htdocs/lib/functions.lib.php
@@ -51,7 +51,7 @@ function GETPOST($paramname,$check='')
     if (!empty($check))
     {
     	// Check if integer
-    	if ($check = 'int' && is_int($out)) $out='';
+    	if ($check = 'int' && ! is_int($out)) $out='';
     }
     
     return $out;