diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index c275e4fd310..06990a3dbd4 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -10757,7 +10757,7 @@ 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';
 	}