diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index c0b5bfd8b..a339d5058 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1655,7 +1655,7 @@ def lmd_ghost(store: Store, start_state: BeaconState, start_block: BeaconBlock)
         children = get_children(store, head)
         if len(children) == 0:
             return head
-        head = max(children, key=get_vote_count)
+        head = max(children, key=lambda x: (get_vote_count(x), hash_tree_root(x)))
 ```
 
 ## Beacon chain state transition function