diff --git a/core/css/multiselect.css b/core/css/multiselect.css
index 8639577f0f..31c8ef88eb 100644
--- a/core/css/multiselect.css
+++ b/core/css/multiselect.css
@@ -9,6 +9,8 @@
  	box-shadow:0 1px 1px #ddd;
  	padding-top:.5em;
  	position:absolute;
+	max-height: 20em;
+	overflow-y: auto;
  	z-index:49;
  }