diff --git a/app/assets/stylesheets/components/textbox.scss b/app/assets/stylesheets/components/textbox.scss
index f3a170eb4..c20769caa 100644
--- a/app/assets/stylesheets/components/textbox.scss
+++ b/app/assets/stylesheets/components/textbox.scss
@@ -56,7 +56,7 @@
   text-align: right;
 }
 
-.extra-tracking .form-control {
+.extra-tracking .govuk-input {
   @include core-19($tabular-numbers: true);
   padding-left: 5px;
   letter-spacing: 0.04em;