diff --git a/MANIFEST.in b/MANIFEST.in
index 47e3080c0..effba2c31 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -2,6 +2,7 @@ include gittaggers.py Makefile cwltool.py
 include tests/*
 include tests/tmp1/tmp2/tmp3/.gitkeep
 include tests/wf/*
+include tests/override/*
 include cwltool/schemas/v1.0/*.yml
 include cwltool/schemas/draft-2/*.yml
 include cwltool/schemas/draft-3/*.yml