diff --git a/Eigen/src/Core/MathFunctions.h b/Eigen/src/Core/MathFunctions.h
index 822701bc3..55077071b 100644
--- a/Eigen/src/Core/MathFunctions.h
+++ b/Eigen/src/Core/MathFunctions.h
@@ -482,12 +482,8 @@ struct arg_default_impl<Scalar, true> {
   EIGEN_DEVICE_FUNC
   static inline RealScalar run(const Scalar& x)
   {
-    #if defined(EIGEN_HIP_DEVICE_COMPILE)
-    // HIP does not seem to have a native device side implementation for the math routine "arg"
+    // There is no official ::arg on device in CUDA/HIP, so we always need to use std::arg.
     using std::arg;
-    #else
-    EIGEN_USING_STD(arg);
-    #endif
     return static_cast<RealScalar>(arg(x));
   }
 };