diff --git a/src/apps/playground/__init__.py b/src/apps/playground/__init__.py
index 417b6ffd..c083b573 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 f36ec9a4..ab7bc583 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. -----------------------------------------------------------------------