diff --git a/src/python/m5/SimObject.py b/src/python/m5/SimObject.py
index f553fd6..20bb5fa 100644
--- a/src/python/m5/SimObject.py
+++ b/src/python/m5/SimObject.py
@@ -681,7 +681,7 @@
         # the object itself, not including inherited params (which
         # will also be inherited from the base class's param struct
         # here). Sort the params based on their key
-        params = map(lambda (k, v): v, sorted(cls._params.local.items()))
+        params = map(lambda k_v: k_v[1], sorted(cls._params.local.items()))
         ports = cls._ports.local
 
         code('''#include "pybind11/pybind11.h"
@@ -777,7 +777,7 @@
         # the object itself, not including inherited params (which
         # will also be inherited from the base class's param struct
         # here). Sort the params based on their key
-        params = map(lambda (k, v): v, sorted(cls._params.local.items()))
+        params = map(lambda k_v: k_v[1], sorted(cls._params.local.items()))
         ports = cls._ports.local
         try:
             ptypes = [p.ptype for p in params]