diff --git a/htdocs/core/class/html.formsetup.class.php b/htdocs/core/class/html.formsetup.class.php
index 4fdf79291bb..69faa334a71 100644
--- a/htdocs/core/class/html.formsetup.class.php
+++ b/htdocs/core/class/html.formsetup.class.php
@@ -449,12 +449,12 @@ class FormSetup
 
 	/**
 	 * Create a new item
-	 * the tagret is useful with hooks : that allow externals modules to add setup items on good place
+	 * The tagret is useful with hooks : that allow externals modules to add setup items on good place
 	 *
 	 * @param string	$confKey 				the conf key used in database
 	 * @param string	$targetItemKey    		target item used to place the new item beside
 	 * @param bool		$insertAfterTarget		insert before or after target item ?
-	 * @return FormSetupItem the new setup item created
+	 * @return FormSetupItem 					the new setup item created
 	 */
 	public function newItem($confKey, $targetItemKey = '', $insertAfterTarget = false)
 	{
@@ -911,7 +911,7 @@ class FormSetupItem
 	 */
 	public function generateInputFieldText()
 	{
-		if (empty($this->fieldAttr)) {
+		if (empty($this->fieldAttr) || empty($this->fieldAttr['class'])) {
 			$this->fieldAttr['class'] = 'flat '.(empty($this->cssClass) ? 'minwidth200' : $this->cssClass);
 		}
 		return '<input '.FormSetup::generateAttributesStringFromArray($this->fieldAttr).' />';
diff --git a/htdocs/modulebuilder/template/admin/setup.php b/htdocs/modulebuilder/template/admin/setup.php
index 36ff46827d4..d843de8a342 100644
--- a/htdocs/modulebuilder/template/admin/setup.php
+++ b/htdocs/modulebuilder/template/admin/setup.php
@@ -102,6 +102,7 @@ $item->cssClass = 'minwidth500';
 // Setup conf for selection of a simple string input
 $item = $formSetup->newItem('MYMODULE_MYPARAM2');
 $item->defaultFieldValue = 'default value';
+$item->fieldAttr['placeholder'] = 'A placehoder here';
 
 // Setup conf for selection of a simple textarea input but we replace the text of field title
 $item = $formSetup->newItem('MYMODULE_MYPARAM3');