diff --git a/Eigen/src/Householder/Householder.h b/Eigen/src/Householder/Householder.h
index 5bc037f00..d8984a347 100644
--- a/Eigen/src/Householder/Householder.h
+++ b/Eigen/src/Householder/Householder.h
@@ -69,7 +69,7 @@ void MatrixBase<Derived>::makeHouseholder(
   Scalar& tau,
   RealScalar& beta) const
 {
-  using std::sqrt;
+  using numext::sqrt;
   using numext::conj;
   
   EIGEN_STATIC_ASSERT_VECTOR_ONLY(EssentialPart)