diff --git a/contrib/auto_gdb/log_size.py b/contrib/auto_gdb/log_size.py
index 8d5084eef1..4bb84e2eb2 100644
--- a/contrib/auto_gdb/log_size.py
+++ b/contrib/auto_gdb/log_size.py
@@ -19,7 +19,7 @@ class LogSizeCommand (gdb.Command):
     def __init__ (self):
         super (LogSizeCommand, self).__init__ ("logsize", gdb.COMMAND_USER)
 
-    def invoke(self, arg, from_tty):
+    def invoke(self, arg, _from_tty):
         try:
             args = gdb.string_to_argv(arg)
             obj = gdb.parse_and_eval(args[0])
diff --git a/contrib/auto_gdb/used_size.py b/contrib/auto_gdb/used_size.py
index 3123eadbe6..9ca88507bb 100644
--- a/contrib/auto_gdb/used_size.py
+++ b/contrib/auto_gdb/used_size.py
@@ -26,7 +26,7 @@ class UsedSizeCommand (gdb.Command):
     def get_type(cls, obj_name):
         return gdb.parse_and_eval(obj_name).type
 
-    def invoke(self, arg, from_tty):
+    def invoke(self, arg, _from_tty):
         try:
             args = gdb.string_to_argv(arg)
             obj = gdb.parse_and_eval(args[1])