diff --git a/Eigen/src/Core/GenericPacketMath.h b/Eigen/src/Core/GenericPacketMath.h
index 8ffc684f2..2e9fd4d7a 100644
--- a/Eigen/src/Core/GenericPacketMath.h
+++ b/Eigen/src/Core/GenericPacketMath.h
@@ -247,7 +247,8 @@ pshiftleft(const long int& a) { return a << N; }
 template <typename Packet>
 EIGEN_DEVICE_FUNC inline Packet pfrexp(const Packet& a, Packet& exponent) {
   int exp;
-  Packet result = std::frexp(a, &exp);
+  EIGEN_USING_STD_MATH(frexp);
+  Packet result = frexp(a, &exp);
   exponent = static_cast<Packet>(exp);
   return result;
 }
@@ -256,7 +257,10 @@ EIGEN_DEVICE_FUNC inline Packet pfrexp(const Packet& a, Packet& exponent) {
   * See https://en.cppreference.com/w/cpp/numeric/math/ldexp
   */
 template<typename Packet> EIGEN_DEVICE_FUNC inline Packet
-pldexp(const Packet &a, const Packet &exponent) { return std::ldexp(a, static_cast<int>(exponent)); }
+pldexp(const Packet &a, const Packet &exponent) {
+  EIGEN_USING_STD_MATH(ldexp);
+  return ldexp(a, static_cast<int>(exponent));
+}
 
 /** \internal \returns zeros */
 template<typename Packet> EIGEN_DEVICE_FUNC inline Packet