diff --git a/htdocs/contact/list.php b/htdocs/contact/list.php
index 1672bdd3f7f..45454485b70 100644
--- a/htdocs/contact/list.php
+++ b/htdocs/contact/list.php
@@ -95,8 +95,8 @@ $search_roles = GETPOST("search_roles", 'array');
 $search_level = GETPOST("search_level", "array");
 $search_stcomm = GETPOST('search_stcomm', 'int');
 
-if ($search_status == '') $search_status = 1; // always display active customer first
-if ($search_no_email == '') $search_no_email = -1;
+if ($search_status === '') $search_status = 1; // always display active customer first
+if ($search_no_email === '') $search_no_email = -1;
 
 $optioncss = GETPOST('optioncss', 'alpha');