diff --git a/protobuf/build.sh b/protobuf/build.sh
index c9fd0e9..3c75ba2 100755
--- a/protobuf/build.sh
+++ b/protobuf/build.sh
@@ -2,4 +2,4 @@
 
 cd `dirname $0`
 
-protoc --python_out=../bitkeylib/ trezor.proto
+protoc --python_out=../trezorlib/ trezor.proto