diff --git a/app/frontend/styles/_testing-tools.scss b/app/frontend/styles/_testing-tools.scss
index 8f89418fc..325d2fbf8 100644
--- a/app/frontend/styles/_testing-tools.scss
+++ b/app/frontend/styles/_testing-tools.scss
@@ -6,7 +6,7 @@
   padding-bottom: 5px;
 }
 
-.app-testing-tools-link {
+.app-testing-tools__link {
   @include govuk-link-common;
   @include govuk-link-style-no-visited-state;
 }