diff --git a/docs/conf.py b/docs/conf.py
index 03de76dd096..6e588ebbf9c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -91,6 +91,7 @@ todo_include_todos = False
 # python keywords highlit in literal blocks.
 highlight_language = 'none'
 
+default_role = 'c:expr'
 
 # -- Options for HTML output ----------------------------------------------