diff --git a/htdocs/comm/mailing/class/advtargetemailing.class.php b/htdocs/comm/mailing/class/advtargetemailing.class.php
index 90132557f38..0e7f2abe76d 100644
--- a/htdocs/comm/mailing/class/advtargetemailing.class.php
+++ b/htdocs/comm/mailing/class/advtargetemailing.class.php
@@ -614,7 +614,7 @@ class AdvanceTargetingMailing extends CommonObject
 						}
 					} elseif ($extrafields->attributes[$elementtype]['type'][$key] == 'boolean') {
 						if ($arrayquery['options_'.$key] != '') {
-							$sqlwhere[] = " (te.".$key." = ".$arrayquery['options_'.$key].")";
+							$sqlwhere[] = " (te.".$key." = ".((int) $arrayquery['options_'.$key]).")";
 						}
 					} else {
 						if (is_array($arrayquery['options_'.$key])) {