diff --git a/src/c2pa/c2pa.py b/src/c2pa/c2pa.py
index d2f9d98e..d4ff669c 100644
--- a/src/c2pa/c2pa.py
+++ b/src/c2pa/c2pa.py
@@ -3327,6 +3327,7 @@ def ed25519_sign(data: bytes, private_key: str) -> bytes:
     'C2paError',
     'C2paSeekMode',
     'C2paSigningAlg',
+    'C2paDigitalSourceType',
     'C2paSignerInfo',
     'C2paBuilderIntent',
     'Stream',