diff --git a/tests_regression/sphinx/test-ref/chapter1.rst b/tests_regression/sphinx/test-ref/chapter1.rst
index 59f52150e..c51fd79a3 100644
--- a/tests_regression/sphinx/test-ref/chapter1.rst
+++ b/tests_regression/sphinx/test-ref/chapter1.rst
@@ -1,7 +1,7 @@
 .. _chapter-1:
 
-One
-===
+:index:`One`
+============
 
 .. _section-a: