diff --git a/scss/_custom-forms.scss b/scss/_custom-forms.scss
index 6511a2998e..8c2ce328f6 100644
--- a/scss/_custom-forms.scss
+++ b/scss/_custom-forms.scss
@@ -114,10 +114,11 @@
 // set. Use these optional classes to tweak the layout.
 
 .custom-controls-stacked {
+  display: flex;
+  flex-direction: column;
+
   .custom-control {
-    float: left;
     margin-bottom: $custom-control-spacer-y;
-    clear: left;
 
     + .custom-control {
       margin-left: 0;