diff --git a/extern/mantaflow/preprocessed/grid.cpp b/extern/mantaflow/preprocessed/grid.cpp
index e0ea3830fae..37e2a4d83df 100644
--- a/extern/mantaflow/preprocessed/grid.cpp
+++ b/extern/mantaflow/preprocessed/grid.cpp
@@ -1886,10 +1886,12 @@ struct knCopyVec3ToReal : public KernelBase {
   }
   void run()
   {
-    if (maxZ > 1)
-      tbb::parallel_for(tbb::blocked_range<IndexInt>(minZ, maxZ), *this);
-    else
-      tbb::parallel_for(tbb::blocked_range<IndexInt>(0, maxY), *this);
+    tbb::this_task_arena::isolate([&](){
+      if (maxZ > 1)
+        tbb::parallel_for(tbb::blocked_range<IndexInt>(minZ, maxZ), *this);
+      else
+        tbb::parallel_for(tbb::blocked_range<IndexInt>(0, maxY), *this);
+    });
   }
   Grid<Vec3> &source;
   Grid<Real> &targetX;