diff --git a/docs/getting_started/rt-svc-writers-guide.rst b/docs/getting_started/rt-svc-writers-guide.rst
index 559d701..51e9d3f 100644
--- a/docs/getting_started/rt-svc-writers-guide.rst
+++ b/docs/getting_started/rt-svc-writers-guide.rst
@@ -92,7 +92,7 @@
 the name of the service, the range of OENs covered, the type of service and
 initialization and call handler functions.
 
-::
+.. code:: c
 
     #define DECLARE_RT_SVC(_name, _start, _end, _type, _setup, _smch)