1 files changed, 3 insertions, 2 deletions
diff --git a/Eigen/src/Core/DiagonalCoeffs.h b/Eigen/src/Core/DiagonalCoeffs.h
index 417daa8ce..030de5cf0 100644
--- a/Eigen/src/Core/DiagonalCoeffs.h
+++ b/Eigen/src/Core/DiagonalCoeffs.h
@@ -52,9 +52,10 @@ struct ei_traits<DiagonalCoeffs<MatrixType> >
                             : EIGEN_ENUM_MIN(MatrixType::MaxRowsAtCompileTime,
                                              MatrixType::MaxColsAtCompileTime),
     MaxColsAtCompileTime = 1,
-    Flags = RowsAtCompileTime == Dynamic || ColsAtCompileTime == Dynamic
+    Flags = RowsAtCompileTime == Dynamic && ColsAtCompileTime == Dynamic
             ? (unsigned int)MatrixType::Flags
-            : (unsigned int)MatrixType::Flags &~ LargeBit
+            : (unsigned int)MatrixType::Flags &~ LargeBit,
+    CoeffReadCost = MatrixType::CoeffReadCost
   };
 };