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-rw-r--r--src/driver/mask.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/driver/mask.cc b/src/driver/mask.cc
index ce7ebf1..38f207e 100644
--- a/src/driver/mask.cc
+++ b/src/driver/mask.cc
@@ -78,7 +78,7 @@ extern struct state state;
namespace {
struct mask_grid_info
{
- cGH *GH; // --> Cactus grid hierarchy
+ const cGH *GH; // --> Cactus grid hierarchy
// Cactus coordinate system
// (for the *current* grid if we are doing mesh refinement)