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-rw-r--r--boost/numeric/odeint/stepper/rosenbrock4_controller.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/numeric/odeint/stepper/rosenbrock4_controller.hpp b/boost/numeric/odeint/stepper/rosenbrock4_controller.hpp
index 4b3824fc08..df4e6c48b6 100644
--- a/boost/numeric/odeint/stepper/rosenbrock4_controller.hpp
+++ b/boost/numeric/odeint/stepper/rosenbrock4_controller.hpp
@@ -66,6 +66,7 @@ public:
{
BOOST_USING_STD_MAX();
using std::abs;
+ using std::sqrt;
const size_t n = x.size();
value_type err = 0.0 , sk = 0.0;