diff --git a/dune/matrix-vector/singlenonzerocolumnmatrix.hh b/dune/matrix-vector/singlenonzerocolumnmatrix.hh index a2c1c15df8305ed5620d388e56df0814edb1177a..7e3ffc366cc7e6ccc420fd59bcef21922bfeb3ed 100644 --- a/dune/matrix-vector/singlenonzerocolumnmatrix.hh +++ b/dune/matrix-vector/singlenonzerocolumnmatrix.hh @@ -96,7 +96,7 @@ public: const_row_reference operator[] (size_type rowIndex) const { - return const_row_reference(&(static_cast<K&>(nonZeroColumn_[rowIndex])), columnIndex_); + return const_row_reference(&(static_cast<const K&>(nonZeroColumn_[rowIndex])), columnIndex_); } size_type nonZeroColumnIndex() const