diff --git a/beacon_node/network/src/sync/block_sidecar_coupling.rs b/beacon_node/network/src/sync/block_sidecar_coupling.rs
index 5de38ad9a5..4eab7f9e67 100644
--- a/beacon_node/network/src/sync/block_sidecar_coupling.rs
+++ b/beacon_node/network/src/sync/block_sidecar_coupling.rs
@@ -1279,6 +1279,7 @@ mod tests {
             execution_requests: ExecutionRequests::default(),
             builder_index: 0,
             beacon_block_root: Hash256::from(rng.random::<[u8; 32]>()),
+            parent_beacon_block_root: Hash256::repeat_byte(0),
         };
         Arc::new(SignedExecutionPayloadEnvelope {
             message: envelope,