diff --git a/source/blender/blenlib/intern/task_pool.cc b/source/blender/blenlib/intern/task_pool.cc
index 6404f5264cc..b098264f72d 100644
--- a/source/blender/blenlib/intern/task_pool.cc
+++ b/source/blender/blenlib/intern/task_pool.cc
@@ -367,7 +367,7 @@ static void background_task_pool_free(TaskPool *pool)
 
 static TaskPool *task_pool_create_ex(void *userdata, TaskPoolType type, TaskPriority priority)
 {
-  const bool use_threads = BLI_task_scheduler_num_threads() > 1 && type != TASK_POOL_NO_THREADS;
+  const bool use_threads = BLI_task_scheduler_num_threads() >= 1 && type != TASK_POOL_NO_THREADS;
 
   /* Background task pool uses regular TBB scheduling if available. Only when
    * building without TBB or running with -t 1 do we need to ensure these tasks
diff --git a/source/blender/depsgraph/intern/depsgraph_eval.cc b/source/blender/depsgraph/intern/depsgraph_eval.cc
index 1ad3fdbc9da..76ddf5e1e71 100644
--- a/source/blender/depsgraph/intern/depsgraph_eval.cc
+++ b/source/blender/depsgraph/intern/depsgraph_eval.cc
@@ -45,6 +45,8 @@
 
 #include "intern/depsgraph.h"
 
+#include "tbb/task_arena.h"
+
 namespace deg = blender::deg;
 
 static void deg_flush_updates_and_refresh(deg::Depsgraph *deg_graph)
@@ -70,7 +72,9 @@ void DEG_evaluate_on_refresh(Depsgraph *graph)
     deg_graph->ctime = ctime;
   }
 
-  deg_flush_updates_and_refresh(deg_graph);
+  tbb::this_task_arena::isolate([&]() {
+    deg_flush_updates_and_refresh(deg_graph);
+  });
 }
 
 /* Frame-change happened for root scene that graph belongs to. */