diff --git a/adb/adb_commands.py b/adb/adb_commands.py
index f3667c8..eed370f 100644
--- a/adb/adb_commands.py
+++ b/adb/adb_commands.py
@@ -31,6 +31,11 @@
 from adb import common
 from adb import filesync_protocol
 
+try:
+    file           # Python 2
+except NameError:  # Python 3
+    file = io.IOBase
+
 # From adb.h
 CLASS = 0xFF
 SUBCLASS = 0x42
diff --git a/adb/filesync_protocol.py b/adb/filesync_protocol.py
index d0547f4..599c499 100644
--- a/adb/filesync_protocol.py
+++ b/adb/filesync_protocol.py
@@ -28,6 +28,12 @@
 from adb import adb_protocol
 from adb import usb_exceptions
 
+try:
+    file           # Python 2
+except NameError:  # Python 3
+    import io
+    file = io.IOBase
+
 # Default mode for pushed files.
 DEFAULT_PUSH_MODE = stat.S_IFREG | stat.S_IRWXU | stat.S_IRWXG
 # Maximum size of a filesync DATA packet.