diff --git a/specs/merge/beacon-chain.md b/specs/merge/beacon-chain.md
index 56476cedd..083bdd00a 100644
--- a/specs/merge/beacon-chain.md
+++ b/specs/merge/beacon-chain.md
@@ -362,7 +362,7 @@ def initialize_beacon_state_from_eth1(eth1_block_hash: Bytes32,
                                       eth1_timestamp: uint64,
                                       deposits: Sequence[Deposit]) -> BeaconState:
     fork = Fork(
-        previous_version=GENESIS_FORK_VERSION,
+        previous_version=ALTAIR_FORK_VERSION,
         current_version=MERGE_FORK_VERSION,  # [Modified in Merge]
         epoch=GENESIS_EPOCH,
     )