diff --git a/tests/stress.c b/tests/stress.c
index e53f415..db8d233 100644
--- a/tests/stress.c
+++ b/tests/stress.c
@@ -18,6 +18,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include <memory.h>
 
 #include "libusb.h"