diff --git a/pypy/objspace/std/listobject.py b/pypy/objspace/std/listobject.py
index 4af48cde08593ae6e0e5e63c6ef91bc5d9cc6c3b_cHlweS9vYmpzcGFjZS9zdGQvbGlzdG9iamVjdC5weQ==..8ef0012859641b2ae7c23e9c4962dc15796b8192_cHlweS9vYmpzcGFjZS9zdGQvbGlzdG9iamVjdC5weQ== 100644
--- a/pypy/objspace/std/listobject.py
+++ b/pypy/objspace/std/listobject.py
@@ -889,7 +889,7 @@
     def is_empty_strategy(self):
         return False
 
-    def physical_size(self):
+    def physical_size(self, w_list):
         raise oefmt(self.space.w_ValueError, "can't get physical size of list")
 
 
@@ -1052,7 +1052,7 @@
     def is_empty_strategy(self):
         return True
 
-    def physical_size(self):
+    def physical_size(self, w_list):
         return 0