diff --git a/test/eigen2/main.h b/test/eigen2/main.h
index 9d0defa39..b361a44d9 100644
--- a/test/eigen2/main.h
+++ b/test/eigen2/main.h
@@ -29,6 +29,10 @@
 #include <string>
 #include <vector>
 
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
+
 #ifndef EIGEN_TEST_FUNC
 #error EIGEN_TEST_FUNC must be defined
 #endif