diff --git a/docs/BLOCK_DEVICE_LOCKING.md b/docs/BLOCK_DEVICE_LOCKING.md
index 87aad67045..862d6f0369 100644
--- a/docs/BLOCK_DEVICE_LOCKING.md
+++ b/docs/BLOCK_DEVICE_LOCKING.md
@@ -118,7 +118,7 @@ Failed to take a BSD lock on /dev/sda: Resource temporarily unavailable
 ```
 
 ## Code
-```
+```c
 /* SPDX-License-Identifier: MIT-0 */
 
 #include <stdio.h>