diff --git a/test_libs/pyspec/tests/test_finality.py b/test_libs/pyspec/tests/test_finality.py
index e97ce7e40..16bf24a4e 100644
--- a/test_libs/pyspec/tests/test_finality.py
+++ b/test_libs/pyspec/tests/test_finality.py
@@ -93,7 +93,7 @@ def test_finality_rule_4(state):
             assert state.finalized_epoch == prev_state.current_justified_epoch
             assert state.finalized_root == prev_state.current_justified_root
 
-    yield 'blocks', [blocks], [spec.BeaconBlock]
+    yield 'blocks', blocks, [spec.BeaconBlock]
     yield 'post', state
 
 
@@ -120,7 +120,7 @@ def test_finality_rule_1(state):
             assert state.finalized_epoch == prev_state.previous_justified_epoch
             assert state.finalized_root == prev_state.previous_justified_root
 
-    yield 'blocks', [blocks], [spec.BeaconBlock]
+    yield 'blocks', blocks, [spec.BeaconBlock]
     yield 'post', state
 
 
@@ -149,7 +149,7 @@ def test_finality_rule_2(state):
 
         blocks += new_blocks
 
-    yield 'blocks', [blocks], [spec.BeaconBlock]
+    yield 'blocks', blocks, [spec.BeaconBlock]
     yield 'post', state
 
 
@@ -195,5 +195,5 @@ def test_finality_rule_3(state):
     assert state.finalized_epoch == prev_state.current_justified_epoch
     assert state.finalized_root == prev_state.current_justified_root
 
-    yield 'blocks', [blocks], [spec.BeaconBlock]
+    yield 'blocks', blocks, [spec.BeaconBlock]
     yield 'post', state