diff --git a/libnfc/buses/usbbus.c b/libnfc/buses/usbbus.c
index 6e0e9d4..184b7c0 100644
--- a/libnfc/buses/usbbus.c
+++ b/libnfc/buses/usbbus.c
@@ -33,6 +33,8 @@
 #  include "config.h"
 #endif // HAVE_CONFIG_H
 
+#include <stdlib.h>
+
 #include "usbbus.h"
 #include "log.h"
 #define LOG_CATEGORY "libnfc.buses.usbbus"