diff --git a/dump.c b/dump.c
index b2118a4..8567655 100644
--- a/dump.c
+++ b/dump.c
@@ -17,6 +17,7 @@
  */
 #include <stdio.h>
 #include <stdint.h>
+#include <stdlib.h>
 
 #include <arpa/inet.h>
 #include <netinet/in.h>