diff --git a/configuration/environments.rst b/configuration/environments.rst
index 6c26d53ff1d..a2fd462f6e5 100644
--- a/configuration/environments.rst
+++ b/configuration/environments.rst
@@ -263,7 +263,7 @@ environment through your browser:
 
     You can achieve this by using a special ``imports`` key:
 
-    .. configuration-block:
+    .. configuration-block::
 
         .. code-block:: yaml