diff --git a/SConscript b/SConscript
index 155f111..1a7d9f5 100644
--- a/SConscript
+++ b/SConscript
@@ -14,9 +14,10 @@ env.Command([f'gen/cpp/{s}.c++' for s in schema_files] + [f'gen/cpp/{s}.h' for s
             schema_files,
             f"capnpc --src-prefix={cereal_dir.path} $SOURCES -o c++:{gen_dir.path}/cpp/")
 
-env.Command([f'gen/py/{s}_capnp.pyi' for s in schema_files] + [f'gen/py/{s}_capnp.py' for s in schema_files],
-            schema_files,
-            f"capnp-stub-generator -p '{cereal_dir.path}/*.capnp' -c '{cereal_dir.path}/*_capnp.pyi' '{cereal_dir.path}/*_capnp.py' -o {cereal_dir.path}/gen/py/")
+if GetOption('extras'):
+  env.Command([f'gen/py/{s}_capnp.pyi' for s in schema_files] + [f'gen/py/{s}_capnp.py' for s in schema_files],
+              schema_files,
+              f"capnp-stub-generator -p '{cereal_dir.path}/*.capnp' -c '{cereal_dir.path}/*_capnp.pyi' '{cereal_dir.path}/*_capnp.py' -o {cereal_dir.path}/gen/py/")
 
 # TODO: remove non shared cereal and messaging
 cereal_objects = env.SharedObject([f'gen/cpp/{s}.c++' for s in schema_files])