diff --git a/setup.cfg b/setup.cfg
index c76b05e..48a0754 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -37,6 +37,7 @@ console_scripts =
     protoc-gen-grpclib_python=grpclib.plugin.main:main
 
 [options.package_data]
+* = *.pyi
 grpclib =
     py.typed