diff --git a/scss/components/_button-group.scss b/scss/components/_button-group.scss
index 68eadcb01..ae672e535 100644
--- a/scss/components/_button-group.scss
+++ b/scss/components/_button-group.scss
@@ -16,7 +16,8 @@
 
             &:focus,
             &:active,
-            &.active {
+            &.active,
+            &.is-active {
                 z-index: 1;
             }
         }