diff --git a/src/packages/buskill/__init__.py b/src/packages/buskill/__init__.py
index 7ff69389..17519150 100644
--- a/src/packages/buskill/__init__.py
+++ b/src/packages/buskill/__init__.py
@@ -410,7 +410,7 @@ def __getstate__(self):
 		# remove instances of multiprocessing.Process() because they're not
 		# pickleable
 		unpickleable = [
-		 'upgrade_process', 'usb_handler'
+		 'upgrade_process', 'usb_handler', 'root_child'
 		]
 		for instance_field in unpickleable:
 			if instance_field in state: