diff --git a/beacon_node/beacon_chain/src/execution_payload.rs b/beacon_node/beacon_chain/src/execution_payload.rs
index bc0c83eac3..f2dfd50115 100644
--- a/beacon_node/beacon_chain/src/execution_payload.rs
+++ b/beacon_node/beacon_chain/src/execution_payload.rs
@@ -363,7 +363,7 @@ where
         .as_ref()
         .ok_or(BlockProductionError::ExecutionLayerMissing)?;
 
-    let parent_hash = if is_merge_transition_complete {
+    let parent_hash = if !is_merge_transition_complete {
         let is_terminal_block_hash_set = spec.terminal_block_hash != ExecutionBlockHash::zero();
         let is_activation_epoch_reached =
             current_epoch >= spec.terminal_block_hash_activation_epoch;