diff --git a/Eigen/src/Core/MathFunctions.h b/Eigen/src/Core/MathFunctions.h
index 67b1d8263..f77724052 100644
--- a/Eigen/src/Core/MathFunctions.h
+++ b/Eigen/src/Core/MathFunctions.h
@@ -260,16 +260,17 @@ struct conj_default_impl<Scalar,true>
   }
 };
 
-template<typename Scalar> struct conj_impl : conj_default_impl<Scalar> {};
+template<typename Scalar, bool IsComplex = NumTraits<Scalar>::IsComplex>
+struct conj_impl : conj_default_impl<Scalar, IsComplex> {};
 
 #if defined(EIGEN_GPU_COMPILE_PHASE)
 template<typename T>
-struct conj_impl<std::complex<T> >
+struct conj_impl<std::complex<T>, true>
 {
   EIGEN_DEVICE_FUNC
   static inline std::complex<T> run(const std::complex<T>& x)
   {
-    return std::complex<T>(x.real(), -x.imag());
+    return std::complex<T>(numext::real(x), -numext::imag(x));
   }
 };
 #endif