diff --git a/rules/S5443/cfamily/rule.adoc b/rules/S5443/cfamily/rule.adoc
index 59184f2325..a76a1f8fb2 100644
--- a/rules/S5443/cfamily/rule.adoc
+++ b/rules/S5443/cfamily/rule.adoc
@@ -6,6 +6,7 @@ include::../recommended.adoc[]
 
 == Sensitive Code Example
 
+[source,cpp]
 ----
 #include <cstdio>
 // ...
@@ -15,6 +16,7 @@ void f() {
 }
 ----
 
+[source,cpp]
 ----
 #include <cstdio>
 #include <cstdlib>