diff --git a/Eigen/src/Core/DiagonalMatrix.h b/Eigen/src/Core/DiagonalMatrix.h
index c4fa11b69..06cfdc170 100644
--- a/Eigen/src/Core/DiagonalMatrix.h
+++ b/Eigen/src/Core/DiagonalMatrix.h
@@ -199,11 +199,6 @@ class DiagonalMatrix
     EIGEN_DEVICE_FUNC
     explicit EIGEN_STRONG_INLINE DiagonalMatrix(const std::initializer_list<std::initializer_list<Scalar>>& list)
       : m_diagonal(list) {}
-    
-    /** \brief Constructs a DiagonalMatrix and initializes it by elements given by an initializer list of values */
-    EIGEN_DEVICE_FUNC
-    explicit EIGEN_STRONG_INLINE DiagonalMatrix(const std::initializer_list<Scalar>& list)
-      : m_diagonal(std::initializer_list<std::initializer_list<Scalar>>{list}) {}
 
     /** \brief Constructs a DiagonalMatrix from an r-value diagonal vector type */
     EIGEN_DEVICE_FUNC