diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 3de1461769b..e1d7fe6ca86 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -11176,7 +11176,7 @@ function dolForgeCriteriaCallback($matches)
 
 	$operand = preg_replace('/[^a-z0-9\._]/i', '', trim($tmp[0]));
 
-	$operator = strtoupper(preg_replace('/[^a-z<>=]/i', '', trim($tmp[1])));
+	$operator = strtoupper(preg_replace('/[^a-z<>!=]/i', '', trim($tmp[1])));
 	if ($operator == 'NOTLIKE') {
 		$operator = 'NOT LIKE';
 	}