--- a/setup.py 2019-01-12 19:10:59.689026006 +0700 +++ b/setup.py 2019-01-12 19:11:07.389973051 +0700 @@ -42,7 +42,7 @@ Extension( "rencode._rencode", extra_compile_args=["-O3"], - sources=["rencode/rencode" + source_ext], + sources=["rencode/_rencode" + source_ext], ), ]