diff --git a/test_libs/pyspec/tests/helpers.py b/test_libs/pyspec/tests/helpers.py
index 214e93f75..44d2dcb4d 100644
--- a/test_libs/pyspec/tests/helpers.py
+++ b/test_libs/pyspec/tests/helpers.py
@@ -27,7 +27,7 @@ from eth2spec.phase0.spec import (
     get_active_validator_indices,
     get_attesting_indices,
     get_block_root,
-    get_crosslink_committee_for_attestation,
+    get_crosslink_committees_at_slot,
     get_current_epoch,
     get_domain,
     get_empty_block,
@@ -276,8 +276,7 @@ def get_valid_attester_slashing(state):
     )
 
 
-def get_crosslink_committee_for_attestation(state: BeaconState,
-                                            attestation_data: AttestationData) -> List[ValidatorIndex]:
+def get_crosslink_committee_for_attestation(state, attestation_data):
     """
     Return the crosslink committee corresponding to ``attestation_data``.
     """