diff --git a/cv7/program.c b/cv7/program.c
index d43bea1..ffa74e2 100644
--- a/cv7/program.c
+++ b/cv7/program.c
@@ -1,6 +1,7 @@
 #include<stdio.h>
 #include<string.h>
 #include<assert.h>
+#include<stdlib.h>
 
 #define SIZE 100