diff --git a/test/vint_test.cpp b/test/vint_test.cpp
index 15e1426..a2d4219 100644
--- a/test/vint_test.cpp
+++ b/test/vint_test.cpp
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#define MCL_MAX_BIT_SIZE 521
 #include <mcl/vint.hpp>
 #include <iostream>
 #include <sstream>