diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index d73761af7..6d72c301c 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1964,7 +1964,7 @@ def update_validator_registry(state: BeaconState) -> None:
     # Exit validators within the allowable balance churn
     balance_churn = 0
     for index, validator in enumerate(state.validator_registry):
-        if validator.activation_epoch == FAR_FUTURE_EPOCH and validator.initiated_exit:
+        if validator.exit_epoch == FAR_FUTURE_EPOCH and validator.initiated_exit:
             # Check the balance churn would be within the allowance
             balance_churn += get_effective_balance(state, index)
             if balance_churn > max_balance_churn: