diff --git a/doc/en/doctest.rst b/doc/en/doctest.rst
index 5a3c76a12..c6e34b2b1 100644
--- a/doc/en/doctest.rst
+++ b/doc/en/doctest.rst
@@ -113,7 +113,7 @@ lengthy exception stack traces you can just write:
 .. code-block:: ini
 
     [pytest]
-    doctest_optionflags= NORMALIZE_WHITESPACE IGNORE_EXCEPTION_DETAIL
+    doctest_optionflags = NORMALIZE_WHITESPACE IGNORE_EXCEPTION_DETAIL
 
 Alternatively, options can be enabled by an inline comment in the doc test
 itself: