diff --git a/packages/components/src/components/list-box/_list-box.scss b/packages/components/src/components/list-box/_list-box.scss
index 44b446cfda6c..704f628ebf3e 100644
--- a/packages/components/src/components/list-box/_list-box.scss
+++ b/packages/components/src/components/list-box/_list-box.scss
@@ -86,12 +86,12 @@ $list-box-menu-width: rem(300px);
     }
   }
 
-  .#{$prefix}--list-box--xl {
+  .#{$prefix}--list-box.#{$prefix}--list-box--xl {
     height: rem(48px);
     max-height: rem(48px);
   }
 
-  .#{$prefix}--list-box--sm {
+  .#{$prefix}--list-box.#{$prefix}--list-box--sm {
     height: rem(32px);
     max-height: rem(32px);
   }