diff --git a/openstack_dashboard/static/dashboard/scss/components/_membership.scss b/openstack_dashboard/static/dashboard/scss/components/_membership.scss
index cc0ad7f78c..ac03492862 100644
--- a/openstack_dashboard/static/dashboard/scss/components/_membership.scss
+++ b/openstack_dashboard/static/dashboard/scss/components/_membership.scss
@@ -137,6 +137,8 @@
   .role_dropdown {
     right: 0;
     left: auto;
+    max-width: 300px;
+    overflow-x: auto;
 
     & > li {
       .fa-check {