diff --git a/bitbake/bin/bitbake-layers b/bitbake/bin/bitbake-layers
index 5abf26cfbd..bdfa4b6a1f 100755
--- a/bitbake/bin/bitbake-layers
+++ b/bitbake/bin/bitbake-layers
@@ -150,7 +150,7 @@ class Commands(cmd.Cmd):
         logger.info('State of append files:')
 
         pnlist = list(self.cooker_data.pkg_pn.keys())
-        pnlist.sort( key=lambda item: item.pn )
+        pnlist.sort()
         for pn in pnlist:
             self.show_appends_for_pn(pn)