1 files changed, 1 insertions, 0 deletions

diff --git a/cmp.c b/cmp.c
index 6b95544..a4b6c7d 100644
--- a/cmp.c
+++ b/cmp.c
@@ -26,6 +26,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include <stdlib.h>
 
 int cmp_main(int argc, char **argv)
 {