diff --git a/stdlib/2and3/base64.pyi b/stdlib/2and3/base64.pyi
index 2385f4071..d61cb3acd 100644
--- a/stdlib/2and3/base64.pyi
+++ b/stdlib/2and3/base64.pyi
@@ -31,9 +31,10 @@ if sys.version_info >= (3, 4):
     def b85decode(b: _decodable) -> bytes: ...
 
 def decode(input: IO[bytes], output: IO[bytes]) -> None: ...
-def decodebytes(s: bytes) -> bytes: ...
 def encode(input: IO[bytes], output: IO[bytes]) -> None: ...
-def encodebytes(s: bytes) -> bytes: ...
+if sys.version_info >= (3,):
+    def encodebytes(s: bytes) -> bytes: ...
+    def decodebytes(s: bytes) -> bytes: ...
 if sys.version_info < (3, 9):
     def encodestring(s: bytes) -> bytes: ...
     def decodestring(s: bytes) -> bytes: ...
diff --git a/third_party/2and3/boto/compat.pyi b/third_party/2and3/boto/compat.pyi
index ce997030a..070c75fe8 100644
--- a/third_party/2and3/boto/compat.pyi
+++ b/third_party/2and3/boto/compat.pyi
@@ -1,7 +1,10 @@
 import sys
 
 from typing import Any
-from base64 import encodestring as encodebytes
+if sys.version_info >= (3,):
+    from base64 import encodebytes as encodebytes
+else:
+    from base64 import encodestring as encodebytes
 
 from six.moves import http_client