diff --git a/_src/entrypoints/bs3-polyfill.scss b/_src/entrypoints/bs3-polyfill.scss
index 454685d..5b2afac 100644
--- a/_src/entrypoints/bs3-polyfill.scss
+++ b/_src/entrypoints/bs3-polyfill.scss
@@ -97,4 +97,7 @@ html {
       @extend .col-xs-#{$i};
     }
   }
+  .nav.flex-column {
+    @extend .nav-stacked;
+  }
 }