diff --git a/tests/core/pyspec/eth2spec/test/bellatrix/sync/test_optimistic.py b/tests/core/pyspec/eth2spec/test/bellatrix/sync/test_optimistic.py
index cf757b583..4fb8adbaf 100644
--- a/tests/core/pyspec/eth2spec/test/bellatrix/sync/test_optimistic.py
+++ b/tests/core/pyspec/eth2spec/test/bellatrix/sync/test_optimistic.py
@@ -79,7 +79,7 @@ def test_from_syncing_to_invalid(spec, state):
         signed_block = state_transition_with_full_block(spec, state, True, True, block=block)
         signed_blocks_b.append(signed_block.copy())
         yield from add_optimistic_block(spec, mega_store, signed_block, test_steps,
-                                        status=PayloadStatusV1Status.SYNCING, valid=False)
+                                        status=PayloadStatusV1Status.SYNCING)
         assert spec.get_head(mega_store.fc_store) == mega_store.opt_store.head_block_root
 
     # Now add block 4 to chain `b` with INVALID
@@ -93,7 +93,7 @@ def test_from_syncing_to_invalid(spec, state):
         validation_error="invalid",
     )
     yield from add_optimistic_block(spec, mega_store, signed_block, test_steps,
-                                    payload_status=payload_status, valid=False)
+                                    payload_status=payload_status)
     assert mega_store.opt_store.head_block_root == signed_blocks_a[-1].message.hash_tree_root()
 
     yield 'steps', test_steps
diff --git a/tests/core/pyspec/eth2spec/test/helpers/optimistic_sync.py b/tests/core/pyspec/eth2spec/test/helpers/optimistic_sync.py
index a89c3083e..6f42aa9ba 100644
--- a/tests/core/pyspec/eth2spec/test/helpers/optimistic_sync.py
+++ b/tests/core/pyspec/eth2spec/test/helpers/optimistic_sync.py
@@ -75,9 +75,18 @@ def get_optimistic_store(spec, anchor_state, anchor_block):
     return opt_store
 
 
+def get_valid_flag_value(status: PayloadStatusV1Status) -> bool:
+    if status == PayloadStatusV1Status.VALID:
+        return True
+    elif status.alias == PayloadStatusV1StatusAlias.NOT_VALIDATED:
+        return True
+    else:
+        # status.alias == PayloadStatusV1StatusAlias.INVALIDATED or other cases
+        return False
+
+
 def add_optimistic_block(spec, mega_store, signed_block, test_steps,
-                         payload_status=None, status=PayloadStatusV1Status.SYNCING,
-                         valid=True):
+                         payload_status=None, status=PayloadStatusV1Status.SYNCING):
     """
     Add a block with optimistic sync logic
 
@@ -99,6 +108,9 @@ def add_optimistic_block(spec, mega_store, signed_block, test_steps,
         'payload_status': payload_status.formatted_output,
     })
 
+    # Set `valid` flag
+    valid = get_valid_flag_value(payload_status.status)
+
     # Optimistic sync
 
     # Case: INVALID