diff --git a/cgo.md b/cgo.md
index e27f3ba..624576f 100644
--- a/cgo.md
+++ b/cgo.md
@@ -217,7 +217,8 @@
 ```
 
 **clibrary.h**
-```
+
+```c
 #ifndef CLIBRARY_H
 #define CLIBRARY_H
 typedef int (*callback_fcn)(int);
@@ -227,7 +228,7 @@
 
 **clibrary.c**
 
-```go
+```c
 #include <stdio.h>
 
 #include "clibrary.h"