diff --git a/app/views/devise/two_factor_authentication/show.html.erb b/app/views/devise/two_factor_authentication/show.html.erb
index 1eea10171..0966af5b3 100644
--- a/app/views/devise/two_factor_authentication/show.html.erb
+++ b/app/views/devise/two_factor_authentication/show.html.erb
@@ -12,7 +12,7 @@
       <p class="govuk-body">We’ve sent you a text message with a security code.</p>
 
       <%= f.govuk_number_field :code,
-        label: { text: "Security code" },
+        label: { text: "Security code", size: "m" },
         width: 5,
         autocomplete: 'one-time-code',
         autofocus: true