diff --git a/tests/core/pyspec/eth2spec/test/phase0/fork_choice/test_on_block.py b/tests/core/pyspec/eth2spec/test/phase0/fork_choice/test_on_block.py
index c00a91b28..79bf353b1 100644
--- a/tests/core/pyspec/eth2spec/test/phase0/fork_choice/test_on_block.py
+++ b/tests/core/pyspec/eth2spec/test/phase0/fork_choice/test_on_block.py
@@ -564,6 +564,7 @@ def test_new_justified_is_later_than_store_justified(spec, state):
 
 @with_all_phases
 @spec_state_test
+@with_presets([MINIMAL], reason="too slow")
 def test_new_finalized_slot_is_not_justified_checkpoint_ancestor(spec, state):
     """
     J: Justified
@@ -641,6 +642,7 @@ def test_new_finalized_slot_is_not_justified_checkpoint_ancestor(spec, state):
 
 @with_all_phases
 @spec_state_test
+@with_presets([MINIMAL], reason="too slow")
 def test_new_finalized_slot_is_justified_checkpoint_ancestor(spec, state):
     """
     J: Justified