diff --git a/client/src/sass/bootstrap.scss b/client/src/sass/bootstrap.scss
index dbe206d05..586f558fe 100644
--- a/client/src/sass/bootstrap.scss
+++ b/client/src/sass/bootstrap.scss
@@ -59,7 +59,8 @@ $icon-font-path: '~@neos21/bootstrap3-glyphicons/assets/fonts/';
 }
 
 /* rules for dropdowns excepts when in button group, to avoid impacting the dropdown-toggle */
-.dropdown {
+.dropdown,
+.dropup {
   z-index: z(dropdown) !important;
 }