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-rw-r--r--unsupported/test/minres.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/unsupported/test/minres.cpp b/unsupported/test/minres.cpp
index 46eb2f0dc..fd12da548 100644
--- a/unsupported/test/minres.cpp
+++ b/unsupported/test/minres.cpp
@@ -7,6 +7,7 @@
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#include <cmath>
#include "../../test/sparse_solver.h"
#include <Eigen/IterativeSolvers>