diff --git a/specs/core/0_fork-choice.md b/specs/core/0_fork-choice.md
index 3cdbcbc5a..95e8ee7a2 100644
--- a/specs/core/0_fork-choice.md
+++ b/specs/core/0_fork-choice.md
@@ -149,7 +149,8 @@ def filter_block_tree(store: Store, block_root: Root, blocks: Dict[Root, BeaconB
     # If any children branches contain expected finalized/justified checkpoints,
     # add to filtered block-tree and signal viability to parent.
     if any(children):
-        if True in [filter_block_tree(store, child, blocks) for child in children]:
+        filter_block_tree_result = [filter_block_tree(store, child, blocks) for child in children]
+        if any(filter_block_tree_result):
             blocks[block_root] = block
             return True
         return False