diff --git a/electrum/commands.py b/electrum/commands.py
index 4b4b67abd..f0005c781 100644
--- a/electrum/commands.py
+++ b/electrum/commands.py
@@ -948,6 +948,7 @@ arg_types = {
     'fee_method': str,
     'fee_level': json_loads,
     'encrypt_file': eval_bool,
+    'timeout': float,
 }
 
 config_variables = {