Fix another issue related to summing up many signed values.
diff --git a/test/array.cpp b/test/array.cpp
index a8fe625..5e2e0e6 100644
--- a/test/array.cpp
+++ b/test/array.cpp
@@ -69,7 +69,7 @@
   using std::abs;
   VERIFY_IS_MUCH_SMALLER_THAN(abs(m1.colwise().sum().sum() - m1.sum()), m1.abs().sum());
   VERIFY_IS_MUCH_SMALLER_THAN(abs(m1.rowwise().sum().sum() - m1.sum()), m1.abs().sum());
-  if (!internal::isApprox(m1.sum(), (m1+m2).sum(), test_precision<Scalar>()))
+  if (!internal::isMuchSmallerThan(abs(m1.sum() - (m1+m2).sum()), m1.abs().sum(), test_precision<Scalar>()))
       VERIFY_IS_NOT_APPROX(((m1+m2).rowwise().sum()).sum(), m1.sum());
   VERIFY_IS_APPROX(m1.colwise().sum(), m1.colwise().redux(internal::scalar_sum_op<Scalar>()));