diff --git a/homework/chapter2/80.c b/homework/chapter2/80.c
index 8d0950c..44b0a0a 100644
--- a/homework/chapter2/80.c
+++ b/homework/chapter2/80.c
@@ -1,5 +1,4 @@
 #include <assert.h>
-#include <stdio.h>
 
 int threefourths(int x) {
   int p = x >> 2, q = x & 3;