diff --git a/setup.py b/setup.py
index 484861b85c..72b011f479 100644
--- a/setup.py
+++ b/setup.py
@@ -586,6 +586,7 @@ def imports(cls, preset_name: str):
         return super().imports(preset_name) + f'''
 from eth2spec.utils import kzg
 from eth2spec.bellatrix import {preset_name} as bellatrix
+from eth2spec.utils.ssz.ssz_impl import serialize as ssz_serialize
 '''
 
     @classmethod
diff --git a/specs/eip4844/validator.md b/specs/eip4844/validator.md
index 7d4f0b3511..6c4e893f92 100644
--- a/specs/eip4844/validator.md
+++ b/specs/eip4844/validator.md
@@ -93,9 +93,10 @@ def is_data_available(slot: Slot, beacon_block_root: Root, blob_kzg_commitments:
 ```python
 def hash_to_bls_field(x: Container) -> BLSFieldElement:
     """
-    This function is used to generate Fiat-Shamir challenges. The output is not uniform over the BLS field.
+    Compute 32-byte hash of serialized container and convert it to BLS field.
+    The output is not uniform over the BLS field.
     """
-    return int.from_bytes(hash_tree_root(x), "little") % BLS_MODULUS
+    return int.from_bytes(hash(ssz_serialize(x)), "little") % BLS_MODULUS
 ```
 
 ### `compute_powers`