diff --git a/docs/process/coding-guidelines.rst b/docs/process/coding-guidelines.rst
index 856882b..930f76c 100644
--- a/docs/process/coding-guidelines.rst
+++ b/docs/process/coding-guidelines.rst
@@ -292,7 +292,7 @@
 If ``MY_STRUCT_SIZE`` in the above example were wrong then the compiler would
 emit an error like this:
 
-.. code:: c
+::
 
   my_struct.h:10:1: error: size of array ‘assert_my_struct_size_mismatch’ is negative