Add some brackets

diff --git a/source/multigrid/mg_transfer_matrix_free.cc b/source/multigrid/mg_transfer_matrix_free.cc
index f17d18086e102117404589f60b922fcb7d33e0c6..13dd1c1a2135b9413a9389917dc439272c051d07 100644 (file)
--- a/source/multigrid/mg_transfer_matrix_free.cc
+++ b/source/multigrid/mg_transfer_matrix_free.cc
@@ -413,8 +413,8 @@ MGTransferMatrixFree<dim, Number>::do_prolongate_add(
        cell += vec_size)
     {
       const unsigned int n_lanes =
-        cell + vec_size > n_owned_level_cells[to_level - 1] ?
-          n_owned_level_cells[to_level - 1] - cell :
+        (cell + vec_size > n_owned_level_cells[to_level - 1]) ?
+          (n_owned_level_cells[to_level - 1] - cell) :
           vec_size;
 
       // read from source vector
@@ -528,8 +528,8 @@ MGTransferMatrixFree<dim, Number>::do_restrict_add(
        cell += vec_size)
     {
       const unsigned int n_lanes =
-        cell + vec_size > n_owned_level_cells[from_level - 1] ?
-          n_owned_level_cells[from_level - 1] - cell :
+        (cell + vec_size > n_owned_level_cells[from_level - 1]) ?
+          (n_owned_level_cells[from_level - 1] - cell) :
           vec_size;
 
       // read from source vector