diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index ba92b601b..ca80daa09 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -350,7 +350,7 @@ The beacon chain fork choice rule is a hybrid that combines justification and fi
 ```python
 def lmd_ghost(store, start):
     validators = start.state.validators
-    active_validators = [validators[i] for i in range(get_active_validator_indices(validators, start.slot))]
+    active_validators = [validators[i] for i in get_active_validator_indices(validators, start.slot)]
     attestation_targets = [get_latest_attestation_target(store, validator) for validator in active_validators]
     def get_vote_count(block):
         return len([target for target in attestation_targets if get_ancestor(store, target, block.slot) == block])