1 files changed, 1 insertions, 1 deletions
diff --git a/extern/mantaflow/preprocessed/fastmarch.h b/extern/mantaflow/preprocessed/fastmarch.h
index 8d0511cc06d..3d0a9d005d9 100644
--- a/extern/mantaflow/preprocessed/fastmarch.h
+++ b/extern/mantaflow/preprocessed/fastmarch.h
@@ -181,7 +181,7 @@ template<class T, int TDIR> class FastMarch {
             Grid<int> &fmFlags,
             Grid<Real> &levelset,
             Real maxTime,
-            MACGrid *velTransport = NULL);
+            MACGrid *velTransport = nullptr);
   ~FastMarch()
   {
   }