diff --git a/k&r/04-funcs-and-prog-struct/04-calc.c b/k&r/04-funcs-and-prog-struct/04-calc.c
index e2c3d51..1929fa7 100644
--- a/k&r/04-funcs-and-prog-struct/04-calc.c
+++ b/k&r/04-funcs-and-prog-struct/04-calc.c
@@ -1,5 +1,4 @@
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 #include <ctype.h> 
 #include <assert.h>