diff --git a/biscuit/test/Spec/SampleReader.hs b/biscuit/test/Spec/SampleReader.hs
index ab9177d..7a23d4d 100644
--- a/biscuit/test/Spec/SampleReader.hs
+++ b/biscuit/test/Spec/SampleReader.hs
@@ -264,6 +264,7 @@ compareParseErrors pe re =
           mustMatchEither
             [ key "Format" . key "Signature" . key "InvalidSignature"
             , key "Format" . key "InvalidSignatureSize"
+            , key "Format" . key "BlockSignatureDeserializationError"
             ]
         InvalidProof ->
           assertFailure $ "InvalidProof can't appear here " <> show re