diff --git a/src/main/java/org/olat/course/nodes/en/ENEditGroupAreaFormController.java b/src/main/java/org/olat/course/nodes/en/ENEditGroupAreaFormController.java
index c9482b557d1322e5c8db809152b3f0b51fc8627c..ffc510f5fd0cf86bfc8835f06c532e9ec898c05d 100644
--- a/src/main/java/org/olat/course/nodes/en/ENEditGroupAreaFormController.java
+++ b/src/main/java/org/olat/course/nodes/en/ENEditGroupAreaFormController.java
@@ -253,6 +253,7 @@ class ENEditGroupAreaFormController extends FormBasicController implements Gener
 		allowMultipleEnroll.addActionListener(FormEvent.ONCLICK);
 		
 		multipleEnrollCount = uifactory.addIntegerElement("form.multipleEnrollCount", enrollCountConfig, formLayout);
+		multipleEnrollCount.setElementCssClass("o_sel_enroll_max");
 		multipleEnrollCount.setMinValueCheck(1, "error.multipleEnroll");
 		multipleEnrollCount.setVisible(allowMultipleEnroll.isSelected(0));