diff --git a/MANIFEST.in b/MANIFEST.in
index 95e97bf38..02bdc73b8 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,3 +3,4 @@ include *.md
 recursive-include tests *
 global-exclude *.pyc
 global-exclode *.pyo
+global-exclode *.un~