diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index f6a5ba93d61..161b0fb92bb 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -1157,7 +1157,7 @@ class ExtraFields
 				} else {
 					$checked = ' value="1" ';
 				}
-				$out = '<input type="checkbox" class="flat '.$morecss.' maxwidthonsmartphone" name="'.$keyprefix.$key.$keysuffix.'" id="'.$keyprefix.$key.$keysuffix.'" '.$checked.' '.($moreparam ? $moreparam : '').'>';
+				$out = '<input type="checkbox" class="flat valignmiddle'.($morecss ? ' '.$morecss : '').' maxwidthonsmartphone" name="'.$keyprefix.$key.$keysuffix.'" id="'.$keyprefix.$key.$keysuffix.'" '.$checked.' '.($moreparam ? $moreparam : '').'>';
 			} else {
 				$out .= $form->selectyesno($keyprefix.$key.$keysuffix, $value, 1, false, 1);
 			}