1 files changed, 1 insertions, 1 deletions
diff --git a/extern/Eigen3/Eigen/src/IterativeLinearSolvers/IterativeSolverBase.h b/extern/Eigen3/Eigen/src/IterativeLinearSolvers/IterativeSolverBase.h
index 11706cebabd..2036922d69c 100644
--- a/extern/Eigen3/Eigen/src/IterativeLinearSolvers/IterativeSolverBase.h
+++ b/extern/Eigen3/Eigen/src/IterativeLinearSolvers/IterativeSolverBase.h
@@ -120,7 +120,7 @@ public:
   RealScalar tolerance() const { return m_tolerance; }
   
   /** Sets the tolerance threshold used by the stopping criteria */
-  Derived& setTolerance(RealScalar tolerance)
+  Derived& setTolerance(const RealScalar& tolerance)
   {
     m_tolerance = tolerance;
     return derived();