diff --git a/src/libusb-sniff.c b/src/libusb-sniff.c
index ce66772..eeb6ec6 100644
--- a/src/libusb-sniff.c
+++ b/src/libusb-sniff.c
@@ -23,6 +23,7 @@
 
 #define _GNU_SOURCE
 #include <stdio.h>
+#include <stdlib.h>
 #include <dlfcn.h>
 #include <usb.h>