diff --git a/userspace/tests/test-big-alloc.c b/userspace/tests/test-big-alloc.c
index 3ca3594c..7fb0098a 100644
--- a/userspace/tests/test-big-alloc.c
+++ b/userspace/tests/test-big-alloc.c
@@ -1,5 +1,7 @@
 #include <stdio.h>
-#include <string.h>
+#include <stdlib.h>
+
+#include <sys/wait.h>
 
 #include "lib/pthread.h"