diff --git a/test_libs/pyspec/eth2spec/fuzzing/test_decoder.py b/test_libs/pyspec/eth2spec/fuzzing/test_decoder.py
index c38fd69af..3c3afa975 100644
--- a/test_libs/pyspec/eth2spec/fuzzing/test_decoder.py
+++ b/test_libs/pyspec/eth2spec/fuzzing/test_decoder.py
@@ -31,3 +31,4 @@ def test_decoder():
 
         # and see if the hash-tree-root of the original matches the hash-tree-root of the decoded & translated value.
         assert spec_ssz_impl.hash_tree_root(original) == spec_ssz_impl.hash_tree_root(block)
+        assert spec_ssz_impl.hash_tree_root(original) == block_sedes.get_hash_tree_root(raw_value)