diff --git a/chapter-04.md b/chapter-04.md
index 0ea8b65..c0b364d 100644
--- a/chapter-04.md
+++ b/chapter-04.md
@@ -705,7 +705,7 @@ Listing 4.6.*](images/04-04.jpg)
      sub  al,al
      endm
      call ZTimerOff
- ```
+```
 
 As you can see, it's easy to be drawn into thinking you're saving cycles
 when you're not. You can only improve the performance of a specific bit