1 files changed, 3 insertions, 1 deletions

diff --git a/bitbake/lib/bb/server/process.py b/bitbake/lib/bb/server/process.py
index ef3ee57aa4..3198635e2f 100644
--- a/bitbake/lib/bb/server/process.py
+++ b/bitbake/lib/bb/server/process.py
@@ -124,8 +124,10 @@ class ProcessServer(Process, BaseImplServer):
         self.command_channel.close()
         self.cooker.shutdown(True)
 
-    def idle_commands(self, delay, fds = []):
+    def idle_commands(self, delay, fds=None):
         nextsleep = delay
+        if not fds:
+            fds = []
 
         for function, data in self._idlefuns.items():
             try: