diff --git a/MANIFEST.in b/MANIFEST.in
index 9aa8813..03b1069 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,6 +3,7 @@ include ChangeLog
 include oaktreemodel/*pb2.py
 exclude .gitignore
 exclude .gitreview
+exclude m4/*
 
 global-exclude *.pyc
 global-exclude *.go
diff --git a/setup.cfg b/setup.cfg
index 7ee1c4a..94ee4d5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,6 +19,5 @@ classifier =
     Programming Language :: Python :: 3.3
     Programming Language :: Python :: 3.4
 
-[files]
-packages =
-    oaktree_model
+[wheel]
+universal = 1