diff --git a/src/plotman/manager.py b/src/plotman/manager.py
index 3fd5a729..4519dfb5 100644
--- a/src/plotman/manager.py
+++ b/src/plotman/manager.py
@@ -277,7 +277,9 @@ def key(key: str) -> job.Phase:
             # allowing handling of just the log file opening error.
 
             if sys.platform == "win32":
-                creationflags = subprocess.CREATE_NO_WINDOW
+                creationflags = (
+                    subprocess.CREATE_NEW_PROCESS_GROUP | subprocess.CREATE_NO_WINDOW
+                )
                 nice = psutil.BELOW_NORMAL_PRIORITY_CLASS
             else:
                 creationflags = 0