diff --git a/gui/qt/__init__.py b/gui/qt/__init__.py
index 8698606d5..e0e33e075 100644
--- a/gui/qt/__init__.py
+++ b/gui/qt/__init__.py
@@ -177,7 +177,7 @@ class ElectrumGui:
         last_wallet = self.config.get('gui_last_wallet')
         if last_wallet is not None and self.config.get('wallet_path') is None:
             if os.path.exists(last_wallet):
-                self.config.read_only_options['default_wallet_path'] = last_wallet
+                self.config.cmdline_options['default_wallet_path'] = last_wallet
         try:
             storage = WalletStorage(self.config.get_wallet_path())
         except BaseException as e:
diff --git a/lib/simple_config.py b/lib/simple_config.py
index 71d8d7188..de5029417 100644
--- a/lib/simple_config.py
+++ b/lib/simple_config.py
@@ -4,7 +4,7 @@ import threading
 import os
 
 from copy import deepcopy
-from util import user_dir, print_error, print_msg
+from util import user_dir, print_error, print_msg, print_stderr
 
 SYSTEM_CONFIG_PATH = "/etc/electrum.conf"
 
@@ -83,7 +83,7 @@ class SimpleConfig(object):
 
     def set_key(self, key, value, save = True):
         if not self.is_modifiable(key):
-            print_error("Warning: not changing config key '%s' set on the command line" % key)
+            print_stderr("Warning: not changing config key '%s' set on the command line" % key)
             return
 
         with self.lock: