diff --git a/app/controllers/ab_tests/elastic_search_aa_testable.rb b/app/controllers/ab_tests/elastic_search_aa_testable.rb
index 4dda8e9c6..26eb6c389 100644
--- a/app/controllers/ab_tests/elastic_search_aa_testable.rb
+++ b/app/controllers/ab_tests/elastic_search_aa_testable.rb
@@ -3,7 +3,7 @@ def elastic_search_aa_test
     GovukAbTesting::AbTest.new(
       "EsSixPointSeven",
       dimension: 41,
-      allowed_variants: %w[A B Z],
+      allowed_variants: %w[A B C Z],
       control_variant: "Z",
     )
   end
diff --git a/spec/controllers/finders_controller_spec.rb b/spec/controllers/finders_controller_spec.rb
index 7f253df22..16bf4b6b0 100644
--- a/spec/controllers/finders_controller_spec.rb
+++ b/spec/controllers/finders_controller_spec.rb
@@ -111,7 +111,7 @@
       end
 
       context "with AA test" do
-        %w[A B Z].each do |variant|
+        %w[A B C Z].each do |variant|
           it "renders the #{variant} variant for /search/all pages" do
             stub_content_store_has_item(
               "/search/all",