diff --git a/specs/sharding/beacon-chain.md b/specs/sharding/beacon-chain.md
index e13ca6c5b..65a0e95b7 100644
--- a/specs/sharding/beacon-chain.md
+++ b/specs/sharding/beacon-chain.md
@@ -714,11 +714,11 @@ def process_pending_headers(state: BeaconState) -> None:
 ```python
 def charge_confirmed_header_fees(state: BeaconState) -> None:
     new_gasprice = state.shard_gasprice
+    previous_epoch = get_previous_epoch(state)
     adjustment_quotient = (
-        get_active_shard_count(state, get_current_epoch(state))
+        get_active_shard_count(state, previous_epoch)
         * SLOTS_PER_EPOCH * GASPRICE_ADJUSTMENT_COEFFICIENT
     )
-    previous_epoch = get_previous_epoch(state)
     previous_epoch_start_slot = compute_start_slot_at_epoch(previous_epoch)
     for slot in range(previous_epoch_start_slot, previous_epoch_start_slot + SLOTS_PER_EPOCH):
         for shard_index in range(get_active_shard_count(state, previous_epoch)):