diff --git a/test_libs/pyspec/tests/block_processing/test_process_attestation.py b/test_libs/pyspec/tests/block_processing/test_process_attestation.py
index 165f0c84a..c986cc4c8 100644
--- a/test_libs/pyspec/tests/block_processing/test_process_attestation.py
+++ b/test_libs/pyspec/tests/block_processing/test_process_attestation.py
@@ -142,3 +142,14 @@ def test_non_empty_custody_bitfield(state):
     pre_state, post_state = run_attestation_processing(state, attestation, False)
 
     return pre_state, attestation, post_state
+
+
+def test_empty_aggregation_bitfield(state):
+    attestation = get_valid_attestation(state)
+    state.slot += spec.MIN_ATTESTATION_INCLUSION_DELAY
+
+    attestation.aggregation_bitfield = b'\x00' * len(attestation.aggregation_bitfield)
+
+    pre_state, post_state = run_attestation_processing(state, attestation)
+
+    return pre_state, attestation, post_state