diff --git a/douzero/dmc/dmc.py b/douzero/dmc/dmc.py
index d1652d1..1bdecc1 100644
--- a/douzero/dmc/dmc.py
+++ b/douzero/dmc/dmc.py
@@ -191,7 +191,7 @@ def train(flags):
             })
 
     parent = psutil.Process()
-    parent.nice(psutil.BELOW_NORMAL_PRIORITY_CLASS)
+    parent.nice(psutil.NORMAL_PRIORITY_CLASS)
     for child in parent.children():
         child.nice(psutil.BELOW_NORMAL_PRIORITY_CLASS)