diff --git a/host/main.c b/host/main.c
index a1e5600..1823857 100644
--- a/host/main.c
+++ b/host/main.c
@@ -19,6 +19,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
 #include <time.h>