diff --git a/MANIFEST.in b/MANIFEST.in
index 9e7c1221b8eb6567b505fea30f313b19d203b2e5..32593440222951ade0e5328eaa0df0f184872124 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -2,6 +2,7 @@ include           LICENSE
 include           COPYRIGHT
 include           requirements.txt
 include           requirements-dev.txt
+include           requirements-extra.txt
 include           pytest.ini
 recursive-include doc      *
 recursive-exclude doc/html *