diff --git a/MANIFEST.in b/MANIFEST.in
index a493fbf4c..aa465ef66 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -5,4 +5,4 @@ include tox.ini
 include *requirements.txt
 
 recursive-include tests *.py
-recursive-include tests/data *.glif *.plist *.fea
+recursive-include tests/data *.glif *.plist *.fea *.ttx