diff --git a/pressure-vessel/copy-source-code.py b/pressure-vessel/copy-source-code.py
index e72adf33dc8e99784046f8508f010ecefb2b4347..899a9ac5c1e2d1aaabd2189ae4e340667214e195 100644
--- a/pressure-vessel/copy-source-code.py
+++ b/pressure-vessel/copy-source-code.py
@@ -82,6 +82,7 @@ def main():
         '--exclude=./.git',
         '--exclude=./.mypy_cache',
         '--exclude=./_build',
+        '--exclude=./builddir',
         '--exclude=./debian',
         '--exclude=./relocatable-install',
         '-cf-',