diff --git a/src/apps/playground/__init__.py b/src/apps/playground/__init__.py
index 417b6ffd37..c083b573e8 100644
--- a/src/apps/playground/__init__.py
+++ b/src/apps/playground/__init__.py
@@ -208,7 +208,7 @@ def layout_tap_to_confirm(address, amount, currency):
 
 @unimport_func
 def zprava():
-    from _io import BytesIO
+    from uio import BytesIO
 
     from trezor.messages.GetAddress import GetAddress
 
diff --git a/src/lib/protobuf/protobuf.py b/src/lib/protobuf/protobuf.py
index f36ec9a4e5..ab7bc5837c 100644
--- a/src/lib/protobuf/protobuf.py
+++ b/src/lib/protobuf/protobuf.py
@@ -2,7 +2,7 @@
 # eigenein (c) 2011
 # http://eigenein.me/protobuf/
 
-from _io import BytesIO
+from uio import BytesIO
 import ustruct
 
 # Types. -----------------------------------------------------------------------
diff --git a/src/trezor/log.py b/src/trezor/log.py
index e8047ff9dc..59b8577f00 100644
--- a/src/trezor/log.py
+++ b/src/trezor/log.py
@@ -1,4 +1,4 @@
-import _io
+import uio
 import sys
 import utime
 
@@ -41,7 +41,7 @@ def error(name, msg, *args):
     _log(name, ERROR, msg, *args)
 
 def exception(name, exc):
-    out = _io.StringIO()
+    out = uio.StringIO()
     sys.print_exception(exc, out)
     _log(name, ERROR, out.getvalue())