diff --git a/beacon_node/beacon_chain/src/beacon_chain.rs b/beacon_node/beacon_chain/src/beacon_chain.rs
index 0d8bbb824..e76bd8daf 100644
--- a/beacon_node/beacon_chain/src/beacon_chain.rs
+++ b/beacon_node/beacon_chain/src/beacon_chain.rs
@@ -1444,6 +1444,20 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                 Err(BlockError::BlockIsAlreadyKnown) => continue,
                 // If the block is the genesis block, simply ignore this block.
                 Err(BlockError::GenesisBlock) => continue,
+                // If the block is is for a finalized slot, simply ignore this block.
+                //
+                // The block is either:
+                //
+                // 1. In the canonical finalized chain.
+                // 2. In some non-canonical chain at a slot that has been finalized already.
+                //
+                // In the case of (1), there's no need to re-import and later blocks in this
+                // segement might be useful.
+                //
+                // In the case of (2), skipping the block is valid since we should never import it.
+                // However, we will potentially get a `ParentUnknown` on a later block. The sync
+                // protocol will need to ensure this is handled gracefully.
+                Err(BlockError::WouldRevertFinalizedSlot { .. }) => continue,
                 // If there was an error whilst determining if the block was invalid, return that
                 // error.
                 Err(BlockError::BeaconChainError(e)) => {