diff --git a/tests/requests/tests.py b/tests/requests/tests.py
index 2d9063f4d1..4aef752894 100644
--- a/tests/requests/tests.py
+++ b/tests/requests/tests.py
@@ -610,7 +610,7 @@ class RequestsTests(SimpleTestCase):
         """
 
         class ExplodingBytesIO(BytesIO):
-            def read(self, len=0):
+            def read(self, size=-1, /):
                 raise OSError("kaboom!")
 
         payload = b"name=value"
@@ -659,7 +659,7 @@ class RequestsTests(SimpleTestCase):
         """
 
         class ExplodingBytesIO(BytesIO):
-            def read(self, len=0):
+            def read(self, size=-1, /):
                 raise OSError("kaboom!")
 
         payload = b"x"